# Bricklayers

Seven bricklayers will build the house in 630 days. How many bricklayers do we need to take after 150 days to complete the building for (additional) 336 days?

Result

n =  3

#### Solution:

$MD=7 \cdot \ 630 \ \\ \ \\ \ \\ 7 \cdot \ 150 + (n+7) \cdot \ 336=7 \cdot \ 630 \ \\ \ \\ 336n=1008 \ \\ \ \\ n=3 \ \\ =3$

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