A B and C can finish a job in 12 15 and 20 days respectively they work together for 2 days and then see left how much time will a and b take to finish the remaining work
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n 1- day A,B and C can do =1/12+1/15+1/20 = 12/60= 1/5 work
In 2- days they do= 2/5 work.
In 1-day A +B can do= 1/12+1/15 =9/60
So the remaining 3/5 of the work can be done by A and B in
=(3/5)÷(9/60) = 4 days.
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