A and b can do a piece of work in 10 days with a alone doing it in 15 days alternative
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we have,
1 day work done by a = 1/15
also,
1 day work done by (a + b) = 1/10
clearly,
1 day work of B = 1 day work done by (a + b) - 1 day work done by a
= 1/10 - 1/15
= 1 / 30
hence, B takes 30 days to complete the work.
Although, you didn't ask the question completely, I still tried to guess what you question my be.
IF THERE IS ANY MISTAKE THEN SORRY
1 day work done by a = 1/15
also,
1 day work done by (a + b) = 1/10
clearly,
1 day work of B = 1 day work done by (a + b) - 1 day work done by a
= 1/10 - 1/15
= 1 / 30
hence, B takes 30 days to complete the work.
Although, you didn't ask the question completely, I still tried to guess what you question my be.
IF THERE IS ANY MISTAKE THEN SORRY
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