If A : B : C = 1 : 4 : 7 and B = (2x)% of (A + C), then x is:
Answer & explanation
Correct answer: option 2
A : B : C = 1 : 4 : 7
Also, B = (2x)% of (A + C)
A:B:C = x/12 : 4x/12 : 7x/12
4x/12 = (2x)% of (x/12 + 7x/12)
4x/12 = (2x)% of (8x/12)
(2x)% = 1/2
(2x)/100 = 1/2
2x = 50
The correct answer is Option (2) → 25