GMAT Quantitative Reasoning Practice Test 2

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Question : 80 of 100

Marks: +1, -0

In the equation

(X+Y=k), k

is a constant and

X

equals 13 when

Y

equals 23.5. What can be the value of

X^2

when

Y^2

is equal to 36 ?

$456.5$
$673.25$
$830.75$
$890.35$
930.25

Solution:

First, find the constant

k

. Plug in the numbers to get

k=13+23.5=36.5

.
Now,

Y^2=36

,

Y=6

or

(-6)

. Plug both numbers to get

X=30.5

or

X=42.5

.
The best answer is

(30.5)^2=930.25

.

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