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 m2

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