• Numerical Ability - Ratio & Proportion
Question

A is directly proportional to B and also directly proportional to C. When B = 6 and C = 2, A = 24. Find the value of A when B = 8 and C = 3. 

  • A) 42
  • B) 40
  • C) 58
  • D) 48
  • E) None of these
Solution

D) 48
Explanation: 
A directly proportional B, A directly proportional to C:
A = kB, A = kC
Or A = kBC
When B = 6 and C = 2, A = 24:
24 = k*6*2
k = 2
Now when B = 8 and C = 3:
A = 2*8*3

D) 48
Explanation: 
A directly proportional B, A directly proportional to C:
A = kB, A = kC
Or A = kBC
When B = 6 and C = 2, A = 24:
24 = k*6*2
k = 2
Now when B = 8 and C = 3:
A = 2*8*3
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