A and b together complete a task in 20 days. B and c together can complete the same task in 40 days. What is the respective ratio of number of days taken by a when completing the same task alone to the number of days taken by c when completing the same task alone? (a)2 : 5 (b)2 : 7 (c)1 : 5 (d)3 : 5
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answer is 3:5
....hope it useful...
Answered by
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Answer:
3:5 .....hope it helps you well
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