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The efficiencies of A, B and C are in th...

The efficiencies of A, B and C are in the ratio 2 : 5 : 7 working together, they can complete a work in 10 days. In how many days will, A alone be able to complete 30% of that work?

A

20

B

28

C

30

D

21

Text Solution

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The correct Answer is:
D
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