Maths A completes 7/10 of a work in 15 days, after that with the help of B, he completes the remaining work in 4 days, in how many days will A and B together complete the whole work?

Q.201426: A completes 7/10 of a work in 15 days, after that with the help of B, he completes the remaining work in 4 days, in how many days will A and B together complete the whole work?
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