What is the equivalent compound ratio of 5:6::7:10::6:5 ?

7 : 9
9 : 7
7 : 4
7 : 10

Correct Answer: 7 : 10

Explanation:

Given 5:6 :: 7:10 :: 6:5

We know that compound ratio is calculated as
a:b :: c:d :: e:f
(axcxe):(bxdxf)

=> (5x7x6):(6x10x5)
=> (210):(300)
= 7:10

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