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  1. Find the compound ratio of 2 : 7, 5 : 3 and 4 : 7 ?
    1. 147 : 40
    2. 40 : 147
    3. 147 : 30
    4. 30 : 147
Correct Option: B

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


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