Question

if A:B=2:3,B:C=5:7 and c:d=3:10, Then what is A:D equal to?

Answer 1

Here A : B = 2 : 3, B : C = 5 : 7, C : D = 3 : 10 

A: B: C: D 

2 3 3 3 

5 5 7 7 

3 3 3 10 

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30: 45: 63: 210 

A : D = 30 : 210 = 1 : 7.