1. A and B can separetely make a wall in 10 day and 15 days before how many
days will B leave the work that the wall would be finished in total 8 days?
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B leaves the work 5 Days before
A completes the work in 10 Days
In one day A does (1/10) th portion
B completes the work in 15 Days
In one day B does (1/15) th portion
In one day A and B do [(1/10) + ( 1/15) ] = [ (3+2)/30] = [ 1/6] th portion
A and B completes the work in 6 Days
In 8 days A does [(1/10) x 8] = ( 4/5 ) th portion
Hence, B completed [1 - (4/5)] = (1/5) th potion
In one day B does (1/15) th portion, so, B completes (1/5) th portion in 3 Days
Hence, B leaves the work ( 8 - 3 = ) 5 Days before
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