Question

57. A can do a piece of work in 20 days and B can do the same work in 30 days. They work together for
4 days and then, A leaves. How long will B take to complete the remaining work?
(a) 25 days
(b) 20 days
(c) 24 days
(d) 22 days
59 The​

Answer 1

Answer:

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Explanation:

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