M05-08

Question

What is the volume of a rectangular box with the three different dimensions of  a ,  b , and  c ?

(1)  a = \frac{12}{bc}

(2)  b = 3, c = 2

Bunuel · Answer

Official Solution:

Question asks about the value of  abc .
 
(1)  a = \frac{12}{bc} . Cross-multiply:  abc=12 . Sufficient.
 
(2)  b = 3  and  c = 2 . Not sufficient as no info about  a .

Answer: A

cricketer · Answer

Buenel,

When the question stem says ''three different dimensions of a, b, and c?'' doesn't it mean that a, b and c are different numbers ?

chetan2u · Answer

Hi,
from A we get abc=12...
abc could be anything.. a=1,b=2,c=6.. a=4,b=3,c=1 and so on..
do not get confused with b=3 and c=2 because we ae not using it..
Although generally in GMAT, the two statements work on the same values of variable and therefore. it would have been better if b and c could have been given some other set of values in statement2..
But in the present case the different dimensions does not have any effect on our answer

hiranmay · Answer

What is the volume of a rectangular box with the three different dimensions of  a ,  b , and  c ?

(1)  a = \frac{12}{bc}  -->  suff: the volume of a rectangular box with the three different dimensions of a,b & c = abc=12

(2)  b = 3, c = 2  -->  insuff: the volume of a rectangular box with the three different dimensions of a,b & c = abc=a*3*2=6a, we don't know the value of a

Answer: A

AnirudhaS · Answer

question stem, we need to find out abc

(1) a=\frac{12}{bc} 
Therefore volume =  abc = \frac{12}{bc} . bc  = 12 cubic units 
Sufficient

(2) b=3, c=2. But we do not know what a is, so abc can be anything depending on the value of a
Not Sufficient

Answer:  A

M05-08

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