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combining the two statements, x, y, z all have the same signs. x (y + z)>0 whether x,y,z are all positive or all negative

x (y + z)=> +(+)>0 or -(-)>0

hence, C

by scoobydooby

Sun Sep 19, 2010 6:08 am
Forum: Data Sufficiency
Topic: x y z ≠ 0, is x (y + z) ≥ 0?
Replies: 3
Views: 2528

would go for B

if we negate B, the argument is weakened. so B must stand. Others are out of scope and give extraneous information

by scoobydooby

Sat Aug 28, 2010 3:00 am
Forum: Critical Reasoning
Topic: knewton Cr-7
Replies: 14
Views: 1859

would go for D.

the conclusion would stand if increasing % spent on non standard treatments left less money available to spend on effective treatments

by scoobydooby

Sat Aug 07, 2010 4:53 am
Forum: Critical Reasoning
Topic: Tough assumption
Replies: 8
Views: 1304

C is out of scope. we need the answer choice to strengthen the conclusion less fossil fuel is now being used due to the change to new technology C doesnt link the more use of electricity to fossil fuels. we do not know how the electricity is generated, whether by fossil fuels or by other sources- wi...

by scoobydooby

Sat Jun 12, 2010 9:12 pm
Forum: Critical Reasoning
Topic: Doubt in CR
Replies: 10
Views: 4654

broad outline of the stimulus: one member of a group was found to have a negative quality, so all members in the group should be examined


only E follows the same oultine as in the stimulus: one large co. underpaid taxes, so all companies must be examined.

by scoobydooby

Sat Jun 12, 2010 6:34 am
Forum: Critical Reasoning
Topic: parallels the argument
Replies: 3
Views: 1421

1)=> j and k are consecutive integers. the GCF of two consecutive integers is 1. sufficient
2) if j=k=10, GCF=10; if j=3 and k=5, GCF is 1. no unique CF obtained. not sufficient.

by scoobydooby

Sun Jun 06, 2010 8:33 am
Forum: Data Sufficiency
Topic: HCF
Replies: 3
Views: 1076

Conclusion:Samuel is a bad fisherman. we need to weaken the conclusion ie, he is not a bad fisherman D shows an alternate cause for his bad performance. He had to use an experimental bait at the order of the captain. the bait may not have been effective and it caused the bad performance. so Samuel m...

by scoobydooby

Fri Jun 04, 2010 9:13 am
Forum: Critical Reasoning
Topic: CR's scope ques.
Replies: 3
Views: 1111

E is good W developed the concept of Continental Drift, but he didnt explain which force caused it, so his theory was rejected. Now, new instruments have confirmed continental drift by observation, so W's theory has been accepted even if there is still no explanantion on what causes continental drif...

by scoobydooby

Fri Jun 04, 2010 5:38 am
Forum: Critical Reasoning
Topic: Continental drift!
Replies: 1
Views: 1395

st 1 : n = 110K +75 n can take any value. st 2 n=100Q + 25 combining st 1 & st 2 100Q -110K =50 when Q=6,K=5 ;100Q -110K =50 finding n, 100Q+25 =625 Remainder when N divided by 10 is 5 Y cant D??? take n =325, when divided by 100 :R is 5 when divided by 110 : R is 105 take n = 425 ,when when divide...

by scoobydooby

Sat May 08, 2010 11:58 am
Forum: Data Sufficiency
Topic: Value of n divided by 10?
Replies: 7
Views: 2702

would go with B


1) given T=110K, T+J+S=360K=>J+S=250K
if J=120K, S=130K then median=120K
if J=50K, S=200K, then median=110K
not sufficient


2)J=120K
if J=S=T=120K, median=120K
if T=40K, S=200K, median=120K
every other combination would yield median 120K
sufficient

by scoobydooby

Fri May 07, 2010 12:46 pm
Forum: Data Sufficiency
Topic: gmat pre question
Replies: 2
Views: 799

1) and 2) are not sufficient by themselves.

together,
% change in N= G(1.04-1)- D(1.15-1)/(G-D)
=> (0.04G-0.15D)/(G-D) cannot be solved
not sufficient

hence, E

by scoobydooby

Fri May 07, 2010 12:32 pm
Forum: Data Sufficiency
Topic: gmat pre question
Replies: 2
Views: 661

would go with D

1) x +1 / y = y +1 / x
=>x-y=1/x - 1/y
=>x-y=(y-x)/xy
=>x-y= -(x-y)/xy
=>xy=-1

hence statement 1 is sufficient as well

by scoobydooby

Fri May 07, 2010 12:26 pm
Forum: Data Sufficiency
Topic: Inequality
Replies: 3
Views: 733

Mary persuaded n friends to donate $500 each to her election campaign, and then each of these n friends persua ded n more people to donate $500 each to Mary’s campaign. If no one donated more than once and if there were no other donations, what was the value of n? (1) The first n people donated o...

by scoobydooby

Fri May 07, 2010 12:17 pm
Forum: Data Sufficiency
Topic: gmat pre question
Replies: 2
Views: 787

a) When x is divided by 2, the remainder is 1 => x is of the form: 2k+1. possible values : 3, 5, 7, 9, 11, 13,15..... when x is divided by 3, the remainder is 0 => x is a multiple of 3. possible values: 3, 6, 9, 12, 15...... satisfying both the above conditions, possible values of x=3,9,15,21... in ...

by scoobydooby

Fri May 07, 2010 11:55 am
Forum: Data Sufficiency
Topic: GMAT Prep-Remainder
Replies: 1
Views: 841

"Lake Michigan is one of the lakes that ___________ (flow/flows) through US" => would go with "flow". the verb "flow" should accord with the plural subject- "lakes". we are in fact referring to the larger group of lakes that flow through US "River X is the one of the rivers that ____________ (flow/f...

by scoobydooby

Thu Apr 29, 2010 9:42 pm
Forum: Sentence Correction
Topic: usage of "one of the"
Replies: 5
Views: 1032