If a and b do a work in 20 days and b and c works in 15 days in how many days they all do the same work.
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a and b work = 20day
a and b work 1day= 1÷20
b and c work =15day
b and c work 1 day = 1÷15
a and b ,b and c are together for 1day= (1/20+1/15)= 7÷60
a and b , b and c do same work at 60/7 day or 8(4/7) day
a and b work 1day= 1÷20
b and c work =15day
b and c work 1 day = 1÷15
a and b ,b and c are together for 1day= (1/20+1/15)= 7÷60
a and b , b and c do same work at 60/7 day or 8(4/7) day
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