Question:If 40 men can build a wall 300 m. long in 12 days working 6 hours a day ; how long will 30 men take to build a similar wall 200 m long, working 8 hours a day ? 

A `4 1/2` days 
B 8 days 
C `10 1/2` days 
D 11 days 

+ Answer
B 

+ Explanation
Less men more days (indirect)

Men 30 : 40

Length 300 : 200   :. 12 : x

Hrs/days 8 : 6

`:. x = ((40 xx 200 xx 6 xx 12)/(30 xx 300 8))`

`= 8`

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Irin Moni

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