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According to the standard, seven tiles are able to pave the sidewalk in 12 shifts. After three shifts, one worker went on holiday. In how many shifts was the sidewalk paved?

Correct answer:

n =  13.5

Step-by-step explanation:

7·12 = 3·7 + 6·(n-3)

6n = 81

n = 81/6 = 13.5

n = 27/2 = 13.5

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