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Manhattan CAT question - need help

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amandeep.hora: Senior | Next Rank: 100 Posts; Posts: 31; Joined: Sun Jul 12, 2009 10:11 am; Thanked: 1 times

by amandeep.hora » Fri Sep 10, 2010 9:40 am

Could someone pls expain this one

A new weight-loss drug causes the loss of body fat in all patients who take the drug. In those same subjects, however, the drug also causes the loss of moderate quantities of lean body mass, where "lean body mass" refers to all body mass other than body fat.

Which of the following statements can be properly inferred from the information in the passage above?
1)Patients taking the new weight-loss drug will not necessarily experience a decrease in their overall percentage of body fat.
2)The body weight of patients taking the new weight-loss drug will not necessarily decrease.
3)The new weight-loss drug contains no chemical that exclusively targets the body's fat cells.
4)Users of the new weight-loss drug should exercise in order to maintain their current levels of lean body mass.
5)The new drug catalyzes the loss of body fat and the loss of lean body mass via similar mechanisms.

Answer A[/b]

Regards
Aman

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Source: Beat The GMAT — Critical Reasoning | Fri Sep 10, 2010 9:40 am

jerseygirl: Junior | Next Rank: 30 Posts; Posts: 16; Joined: Sun Sep 05, 2010 11:54 am; Thanked: 1 times

by jerseygirl » Fri Sep 10, 2010 11:20 am

amandeep.hora wrote:Could someone pls expain this one

A new weight-loss drug causes the loss of body fat in all patients who take the drug. In those same subjects, however, the drug also causes the loss of moderate quantities of lean body mass, where "lean body mass" refers to all body mass other than body fat.

Which of the following statements can be properly inferred from the information in the passage above?
1)Patients taking the new weight-loss drug will not necessarily experience a decrease in their overall percentage of body fat.
2)The body weight of patients taking the new weight-loss drug will not necessarily decrease.
3)The new weight-loss drug contains no chemical that exclusively targets the body's fat cells.
4)Users of the new weight-loss drug should exercise in order to maintain their current levels of lean body mass.
5)The new drug catalyzes the loss of body fat and the loss of lean body mass via similar mechanisms.

Answer A[/b]

Here's my take on it:

Basically, the stem is saying that the drug causes loss in fat in all patients as well as moderate loss in lean body mass.

1) will revisit
2) the stem doesn't address how loss in fat or lean body mass will impact the patient (though perhaps it's reasonable to assume that the there will be weight loss, in which case this answer choice doesn't work)
3) the drug may indeed include a chemical that exclusively targets fat cells; it may also include other chemicals that result in loss of lean body mass.
4) out of scope / the stem doesn't address how exercising would affect lean body mass
5) the drug may trigger very different mechanisms that achieve the result cited...

A is right because as body fat decreases, lean body mass also decreases. The resulting ratio (percentage of body fat) may be the same. for example, let's say you had 40% body fat (4 out of 10 grams of mass). then, let's say that as a result of the drug, you got a fat loss of 2 g. then less say that the drug also reduced your lean body mass by 5 grams. the resulting ratio 2 to 5 is the same as the original 4 to 10. A as an answer choice leaves options for results open.

Hope this helps, and looking forward to feedback if my reasoning is off...

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diebeatsthegmat: Legendary Member; Posts: 1119; Joined: Fri May 07, 2010 8:50 amFollowed by: 3 members; Thanked: 29 times

by diebeatsthegmat » Fri Sep 10, 2010 11:53 pm

amandeep.hora wrote:Could someone pls expain this one

A new weight-loss drug causes the loss of body fat in all patients who take the drug. In those same subjects, however, the drug also causes the loss of moderate quantities of lean body mass, where "lean body mass" refers to all body mass other than body fat.

Which of the following statements can be properly inferred from the information in the passage above?
1)Patients taking the new weight-loss drug will not necessarily experience a decrease in their overall percentage of body fat.
2)The body weight of patients taking the new weight-loss drug will not necessarily decrease.
3)The new weight-loss drug contains no chemical that exclusively targets the body's fat cells.
4)Users of the new weight-loss drug should exercise in order to maintain their current levels of lean body mass.
5)The new drug catalyzes the loss of body fat and the loss of lean body mass via similar mechanisms.

Answer A[/b]

one question is made out after i've done reading this CR is the drug makes not only the fat but also lean mass lost... what can be sure that the body lost weight is 100% because of losing the fat mass or lean mass or both? A can answer that
thus A makes sense for me
but i am also wondering E however well, E is not very clear....

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gmatmachoman: Legendary Member; Posts: 2326; Joined: Mon Jul 28, 2008 3:54 amFollowed by: 2 members; Thanked: 173 times; GMAT Score:710

by gmatmachoman » Sat Sep 11, 2010 12:13 am

jerseygirl wrote:
amandeep.hora wrote:Could someone pls expain this one

A new weight-loss drug causes the loss of body fat in all patients who take the drug. In those same subjects, however, the drug also causes the loss of moderate quantities of lean body mass, where "lean body mass" refers to all body mass other than body fat.

Which of the following statements can be properly inferred from the information in the passage above?
1)Patients taking the new weight-loss drug will not necessarily experience a decrease in their overall percentage of body fat.
2)The body weight of patients taking the new weight-loss drug will not necessarily decrease.
3)The new weight-loss drug contains no chemical that exclusively targets the body's fat cells.
4)Users of the new weight-loss drug should exercise in order to maintain their current levels of lean body mass.
5)The new drug catalyzes the loss of body fat and the loss of lean body mass via similar mechanisms.

Answer A[/b]
Here's my take on it:

Basically, the stem is saying that the drug causes loss in fat in all patients as well as moderate loss in lean body mass.

1) will revisit
2) the stem doesn't address how loss in fat or lean body mass will impact the patient (though perhaps it's reasonable to assume that the there will be weight loss, in which case this answer choice doesn't work)
3) the drug may indeed include a chemical that exclusively targets fat cells; it may also include other chemicals that result in loss of lean body mass.
4) out of scope / the stem doesn't address how exercising would affect lean body mass
5) the drug may trigger very different mechanisms that achieve the result cited...

A is right because as body fat decreases, lean body mass also decreases. The resulting ratio (percentage of body fat) may be the same. for example, let's say you had 40% body fat (4 out of 10 grams of mass). then, let's say that as a result of the drug, you got a fat loss of 2 g. then less say that the drug also reduced your lean body mass by 5 grams. the resulting ratio 2 to 5 is the same as the original 4 to 10. A as an answer choice leaves options for results open.

Hope this helps, and looking forward to feedback if my reasoning is off...

okay, l wanna take a head on with ur statement JerseyGirl!
Initial Body weight : 10gms
Body fat : 4 gms
Lean body mass : 6
percentage of Body fat in Body : 40%

After Usage of drugs:

New Body fat : 1 gm
New Lean Body mass : 5 gms
Percentage of Body fat : 17%

17% is less than 40%. SO that contradicts A!!

ANy thoughts on that??

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jerseygirl: Junior | Next Rank: 30 Posts; Posts: 16; Joined: Sun Sep 05, 2010 11:54 am; Thanked: 1 times

by jerseygirl » Sat Sep 11, 2010 4:19 am

gmatmachoman wrote:
jerseygirl wrote:
amandeep.hora wrote:Could someone pls expain this one
...
1)Patients taking the new weight-loss drug will not necessarily experience a decrease in their overall percentage of body fat.
...
okay, l wanna take a head on with ur statement JerseyGirl!
Initial Body weight : 10gms
Body fat : 4 gms
Lean body mass : 6
percentage of Body fat in Body : 40%

After Usage of drugs:

New Body fat : 1 gm
New Lean Body mass : 5 gms
Percentage of Body fat : 17%

17% is less than 40%. SO that contradicts A!!

ANy thoughts on that??
yep.

reread answer A. It says, "Patients taking the new weight-loss drug will not necessarily experience a decrease in their overall percentage of body fat."

This means that they may or may not experience a decrease in their overall percentage of body fat, which accounts for the scenarios you listed above. I was just illustrating that even though body fat and lean body mass go down in quantity, they can stay the same and therefore may not "necessarily experience a decrease.."

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amit2k9: Master | Next Rank: 500 Posts; Posts: 461; Joined: Tue May 10, 2011 9:09 amFollowed by: 3 members; Location: pune; Thanked: 36 times

by amit2k9 » Tue Nov 29, 2011 10:15 pm

clean A with a POE.
B comes close however,weight loss is definite as mentioned in the facts based para.

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tuanquang269: Master | Next Rank: 500 Posts; Posts: 296; Joined: Sun May 29, 2011 5:10 amFollowed by: 5 members; Location: Vietnam; Thanked: 10 times

by tuanquang269 » Sun Dec 11, 2011 8:52 am

gmatmachoman wrote:
A new weight-loss drug causes the loss of body fat in all patients who take the drug. In those same subjects, however, the drug also causes the loss of moderate quantities of lean body mass, where "lean body mass" refers to all body mass other than body fat.

Which of the following statements can be properly inferred from the information in the passage above?
1)Patients taking the new weight-loss drug will not necessarily experience a decrease in their overall percentage of body fat.

Initial Body weight : 10gms
Body fat : 4 gms
Lean body mass : 6
percentage of Body fat in Body : 40%

After Usage of drugs:

New Body fat : 1 gm
New Lean Body mass : 5 gms
Percentage of Body fat : 17%

17% is less than 40%. SO that contradicts A!!

ANy thoughts on that??

I think your degree of decreasing in your example is not enough. Let's I try again your example with larger number.

Initial Body weight : 10gms
Body fat : 4 gms
Lean body mass : 6
percentage of Body fat in Body : 40%

After Usage of drugs:

New Body fat : 1 gm
New Lean Body mass : 2 gms
Percentage of Body fat : 50%

So, that why choice A states phrase "not necessarily decrease..."

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