A and B can do a piece of work in 30 and 36 d | vedclass

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(C) Efficiency of $A = 1/30$ units per day.Efficiency of $B = 1/36$ units per day.Let $A$ and $B$ work together for $x$ days.Work done by $B$ alone in

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$5$

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(C) Efficiency of $A = 1/30$ units per day.Efficiency of $B = 1/36$ units per day.Let $A$ and $B$ work together for $x$ days.Work done by $B$ alone in $25$ days $= 25 	imes (1/36) = 25/36$.Remaining work done by $A$ and $B$ together $= 1 - 25/36 = 11/36$.Combined efficiency of $A$ and $B = 1/30 + 1/36 = (6+5)/180 = 11/180$.Time taken by $A$ and $B$ to complete $11/36$ of the work $= (11/36) / (11/180) = (11/36) 	imes (180/11) = 5$ days.Therefore,$A$ left the work after $5$ days.

$A$ and $B$ can do a piece of work in $30$ and $36$ days respectively. They began the work together,but $A$ leaves after some days and $B$ finished the remaining work in $25$ days. After how many days did $A$ leave?

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