Exams › SSC CGL (Prelims) › General

Given A : B = 7 : 9, B : C = 3 : 5 and C : D = 8 : 11, find the combined ratio A : B : C : D.

1. 56 : 72 : 120 : 165
2. 7 : 9 : 5 : 11
3. 21 : 27 : 45 : 66
4. 189 : 243 : 405 : 528

Correct answer: 56 : 72 : 120 : 165

Solution

A : B = 7 : 9 and B : C = 3 : 5 = 9 : 15 give A : B : C = 7 : 9 : 15. Matching C with C : D = 8 : 11 by multiplying gives 56 : 72 : 120 : 165.

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