A and b can complete a work in 15 and 10days they started doing the work together but after 2 days b had to leave and a alone can complete the remaining work the whole work
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a can do the whole work in 15 days , therefore a's one day work = 1/15
b can do the whole work in 10 days ; therefore b's one day work =1/10
a+b one days work = 1/15+1/10
a and b work together for two days ; therefore in two days they do
2/15+2/10 part of work = 10/30= 1/3
After two days b leaves ; therefore part of work left to do...1-1/3=2/3
a does full work in 15 days; therefore a does 2/3 of remaining work in
2/3*15=10 days
Hope this helps!!
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