Simplification - Quantitative Aptitude (MCQ) questions for Q. 20724

Q.  The value of “A” varies in inverse proportion as the square of “B”. If the value of “A” is equal to 40 when “B” is equal to 12. What would be the value of “A” when “B” is equal to 24 ?
- Published on 07 Jul 17

a. 10
b. 15
c. 20
d. 22
e. None of these

ANSWER: 10
 
We have, A α 1/B2
A * B2 = K (constant)
When B = 12, A = 40 …..Given
K = 40 * (12)2 = 5760
Now, B = 24. Hence, A = 5760 / 576 = 10

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