# math

a contractor needs two men and 5 litres of paint to paint on a fenced wall that is 40m by 3m in 9 hours. how many men and how much paint does he need to paint a fenced wall 20m by 12m in 3 hours

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1. Paint: 5litres/120m^2/5litres=24m^2/liter (wow).
Paint needed: 1liter/24m^2 * 240m^2= 10 liters
manhours per m^2= 2*9/120=18/120=.15manhours/m^2
manhours needed on new job= .15*240=36 manhours
number men= 12 men
You are getting twice the area, in 3 times as fast. 3*2*2men=12men

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bobpursley
2. That was a sexist question, women can paint also.

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bobpursley

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