Practicing Success
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CUET
General Test
Numerical Ability
Ratios
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.
30
9
27
18
We know X ∝ Y²
Thus, ratio X : Y² = constant
X : Y²
12 : 4 = 3 : 1
When Y = 3, Y² = 9
X = 27