Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Numerical Ability

Topic

Ratios

Question:

X is directly proportional to the square of Y. When X is 12, then Y is 2. Find the value of X when Y is 3.

Options:

30

9

27

18

Correct Answer:

27

Explanation:

We know X ∝ Y²

Thus, ratio X : Y² = constant 

       X  :  Y²

      12 :  4   = 3  :  1

When Y = 3, Y² = 9

                   X  = 27