GMAT Quantitative Reasoning Practice Test 2

Question : 79 of 100

Marks: +1, -0

In the equation

4 Y-3 k X=18, k

is a constant and

Y

equals 42 when

X

equals 12. What is the approximate value of

X

when

Y

equals 36 ?

Solution:

First, find the constant

k

. Plug in the numbers for

X

and

Y

, to receive

4 × 42-3 k × 12=18 k

=(18-168) {/} 36=-25 {/ }6

Now, plug in the value of

Y

to receive:

4 × 36-3 k X=18

after a little math,

X

is equal to 10.08 , therefore the approximate answer is 10 .

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