A can do a piece of work in 28 days, while b can do the same piece of work in 42 days. They begin working together and 6 days before completion of work, a leaves. Find the total number of days taken to complete the
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piece of work done by a in one day-1by 28
piece of work done by b in one day-1by 42
a+b working together- 1/28 + 1/42
5/74 days
time taken to do the work- 1÷5/74
74/5=14 whole 4 by 5 days
i hope this is right.
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