Eight masons

Eight masons will plaster a wall with an area of 1440 m2 in 9 days. They work 8 hours a day. How much area will plaster 6 masons in 4 hours?

Correct result:

S =  60 m2


m=1440/(8 9 8)=52=2.5 m2/m/h  S=m 6 4=2.5 6 4=60 m2m=1440 / (8 \cdot \ 9 \cdot \ 8)=\dfrac{ 5 }{ 2 }=2.5 \ \text{m}^2\text{/m/h} \ \\ \ \\ S=m \cdot \ 6 \cdot \ 4=2.5 \cdot \ 6 \cdot \ 4=60 \ \text{m}^2

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