A, b and c can finish a work in 20, 24 and 30 days respectively. They start working together. If b stops after 4 days, how long would it take a and c to finish the remaining?
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a can do a piece of work in 1\20 days
B can do a piece of work in 1\24 days
C can do a piece of work in 1\30days
together work=1\20+1\24+1\30=LCM of 20, 24, 30=1\8
work done + one day by ABC=1\8×2=2\8
remaining work=1\1-2\8 LCM
work done by A and c=
1\20=1\30 LCM of 4 and C =1\12
time required to a and c=2\8÷1\12=3
knc can finish the work in 3 days
B can do a piece of work in 1\24 days
C can do a piece of work in 1\30days
together work=1\20+1\24+1\30=LCM of 20, 24, 30=1\8
work done + one day by ABC=1\8×2=2\8
remaining work=1\1-2\8 LCM
work done by A and c=
1\20=1\30 LCM of 4 and C =1\12
time required to a and c=2\8÷1\12=3
knc can finish the work in 3 days
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