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Find the compound ratio of 2 : 7, 5 : 3 and 4 : 7?

147 : 40
40 : 147
147 : 30
30 : 147

Correct Answer: 40 : 147

Explanation:

Required compound ratio = (2 x 5 x 4) / (7 x 3 x 7)
= 40/147
= 40 : 147

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