Cleaning windows

The cleaning company has to wash all the school windows. On the first day, one-sixth of the windows are washed. The next day, three more windows are washed than the first day, and the remaining 18 windows are washed on the third day. Calculate how many windows have school.

Correct answer:

n =  54

Step-by-step explanation:


n/6+3n/6+18=n

n/6+3·n/6+18=n

2n = 108


n = 108/2 = 54

n = 54

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