Raman can do a piece of work in 10 days and 13 days if both of them work together how long will they take to finish the work
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Raman can do a piece of work in 1 day =1/10
if both of them work together in 1 day= 1/13
(1/10+1/13) days
(13+10/130) days
23/130 days
130/23 days =5 whole 15 upon 23
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