A alone can complete a piece of work in 20 days, which b alone find total number of days
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A work for 5 days , so he work 5/20 = 1/4 work
Remaining 3/4 is done by B in 10 days
So B take 10*4/3 = 40/3 days
Together
1/20 + 3/40
= 5/40
= 1/8
= 8 days
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