Hi,
Pls answer the powerprep question. I think I am overlooking some information here.
Thanks
Amit
PowerPrep...number line DS question
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Hi erjamit,
I would go with E also.
The statement says mod(A-B)=18 and mod(c-d)=8, what is the mod(B-D)?
(1) mod(C-A)=mod(C-B)
you get A=B or A+B=2C, INSUFF
(2) gives no relevant information concerning the question, INSUFF
(1+2) nothing new, INSUFF
Answer E
I would go with E also.
The statement says mod(A-B)=18 and mod(c-d)=8, what is the mod(B-D)?
(1) mod(C-A)=mod(C-B)
you get A=B or A+B=2C, INSUFF
(2) gives no relevant information concerning the question, INSUFF
(1+2) nothing new, INSUFF
Answer E
I will illustrate as following:-
From the question stem:-
A ---------------------------------------- B = 18
or
B ---------------------------------------- A = 18
and CD = 8.
1) CA = CB => C is the mid-point of A.
2 scenarios can come here...
A ------------------C---------------------- B = 18
or
B -------------------C--------------------- A = 18
Insuff...
2) A is to left of D.
Insuff..
Combining 1 and 2.
A ----D---------------C--------------------- B
or
B ---------------------C------------------A---D
The 2nd figure contradicts CD = 8 since CA = 9 and CD = 8. Thus, the only valid figure is 1st one.
So, IMO answer should be C.
Can someone pls comment what mistake I am making.
Thanks
Amit
From the question stem:-
A ---------------------------------------- B = 18
or
B ---------------------------------------- A = 18
and CD = 8.
1) CA = CB => C is the mid-point of A.
2 scenarios can come here...
A ------------------C---------------------- B = 18
or
B -------------------C--------------------- A = 18
Insuff...
2) A is to left of D.
Insuff..
Combining 1 and 2.
A ----D---------------C--------------------- B
or
B ---------------------C------------------A---D
The 2nd figure contradicts CD = 8 since CA = 9 and CD = 8. Thus, the only valid figure is 1st one.
So, IMO answer should be C.
Can someone pls comment what mistake I am making.
Thanks
Amit
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- Master | Next Rank: 500 Posts
- Posts: 320
- Joined: Sun Jan 13, 2008 10:00 pm
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erjamit,
You are right that the second chouce is not valid, But you could consider an other option like this,
A---------------C-----------D---B; this would still satify that A is to the left of D
Bt you could see that the BD distance is now 9-8 =1; and from the first figure you drew, we got BD as 9 + 8= 17; so it's insifficient.
All statement 2 says is, A is of lower value then D, since on a number line, any point which is left to an other point is of lower value than the point to the right.
You are right that the second chouce is not valid, But you could consider an other option like this,
A---------------C-----------D---B; this would still satify that A is to the left of D
Bt you could see that the BD distance is now 9-8 =1; and from the first figure you drew, we got BD as 9 + 8= 17; so it's insifficient.
All statement 2 says is, A is of lower value then D, since on a number line, any point which is left to an other point is of lower value than the point to the right.