Our house

Our house would paint by four painters in 14 days. How long could it paint five painters? How long will it take if two other painters come to help after five days?

Correct answer:

a =  11.2 d
b =  11 d

Step-by-step explanation:

m=4 14=56 MD a=m/5=56/5=11.2 d

4·14 = 4·5 + (b-5)·(4+2)

6b = 66

b = 66/6 = 11

b = 11

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