Question:A man, a woman or a boy can do a piece of work in 3, 4 and 12 days respectively. How many boys must one man and one woman to do the work in one day ? 

A 6 
B 8 
C 9 
D 5 

+ Answer
D 

+ Explanation
1 man's 1 day's work` = 1/3,` 1 woman's 1 days work` = 1/4,`

1 boy's 1 day's work` = 1/12`

Let x boys must be there. Then

`1/3 + 1/4 + x/12`

`= 1 => x = 5.`

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Irin Moni

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