a can do a piece of workin 15 days while B can do it in 10 days. how long will they take together to do it
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Step-by-step explanation:
A B
15 10
30
efficiency of A = 30/15 = 2
efficiency of B = 30/10 = 3
total efficiency =. 2+3 = 5
total work = 30
time = 30/5 = 6 days
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