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प्रश्न
A can do a piece of work in 10 days and B in 15 days. How long will they take together to finish it?
उत्तर
A's 1-day work =`1/10`
B's 1-day work =`1/15`
(A + B)'s 1-day work =`1/10+1/15`
`=(3+2)/30=5/30`
`=1/6`
∴ Both A and B together can finish the work in = 6 days
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