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Q: If A : B = 2 : 5 and B : C = 3 : 4, then A : C = ?
  • A. 1:2
  • B. 3:10
  • C. 2:3
  • D. 5:4
Correct Answer: Option B - A : B = 2:5..........(i) B : C = 3:4..........(ii) Multiplying by 3 in equation (i) and by 5 in equation(ii) A : B = 6:15 B : C = 15:20 Required ratio, A : B : C = 6:15:20 So A : C = 6:20 A : C = 3:10
B. A : B = 2:5..........(i) B : C = 3:4..........(ii) Multiplying by 3 in equation (i) and by 5 in equation(ii) A : B = 6:15 B : C = 15:20 Required ratio, A : B : C = 6:15:20 So A : C = 6:20 A : C = 3:10

Explanations:

A : B = 2:5..........(i) B : C = 3:4..........(ii) Multiplying by 3 in equation (i) and by 5 in equation(ii) A : B = 6:15 B : C = 15:20 Required ratio, A : B : C = 6:15:20 So A : C = 6:20 A : C = 3:10