1.

Tow boy can do a piece of work in ten days. Three girls can do the same work in five days. In how many days can a boy and a girl together do the work?

Answer»

16 days
` 8 4/7 `days
12 days
`5 1/2` days

Solution :GIVEN that two boys can do the work in ten days, three
girls can do it in five days
`THEREFORE` One boy can do the work in `2xx10=20` days
One girl can do the work in `3xx 5 = 15` days
`therefore` Number of days taken by a boy and a girl working
TOGETHER to finish the work
` =( 1)/((1)/(15)+(1)/(20)) =(60)/(4+3) = (60)/(7) = 8 (4)/(7)` days


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