Four painters

The company sent four painters to paint the school. They should be done in 12 days. After three days, one painter got ill. How long will the remaining painters paint the school?

Correct answer:

x =  12 d

Step-by-step explanation:


4·12 = 4·3 + (4-1)·x

3x = 36


x = 36/3 = 12

x = 12

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