Exams › SSC CGL (Prelims) › General

Given A : B = 4 : 9, B : C = 3 : 7 and C : D = 5 : 2, determine the combined ratio A : B : C : D.

1. 20 : 45 : 105 : 42
2. 4 : 9 : 7 : 2
3. 12 : 27 : 63 : 18
4. 20 : 105 : 45 : 42

Correct answer: 20 : 45 : 105 : 42

Solution

Equalising B gives A : B = 4 : 9 and B : C = 9 : 21, so A : B : C = 4 : 9 : 21. Equalising C with C : D = 5 : 2 = 21 : 8.4 leads, after scaling by 5, to 20 : 45 : 105 : 42.

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