A man, a women or a boy can do a job in 3, 4 or 12 days respectively. how many boys must assist 1 man and woman to do job in one and a half day?
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amount of work completed by man in one day=1/3
amount of work completed by womman in one day=1/4
amount of work completed by child in one day=1/12
let n boys help one man and one woman,then work done by them in one day is
1/3+1/4+n/12=4/12+3/12+n/12=(7+n)/12
they should complete work in one day,so(7+n)/12=1
7+n=12 =>n=5
so 5 boys should help them.
amount of work completed by womman in one day=1/4
amount of work completed by child in one day=1/12
let n boys help one man and one woman,then work done by them in one day is
1/3+1/4+n/12=4/12+3/12+n/12=(7+n)/12
they should complete work in one day,so(7+n)/12=1
7+n=12 =>n=5
so 5 boys should help them.
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