Bricklayers

Eight bricklayers build a house for 630 days. How many bricklayers have to add after 150 days to complete the whole building in (next) 320 days?

Correct answer:

n =  4

Step-by-step explanation:


150/630+(n+8)·320/(630·8)=1

40n = 160


n = 160/40 = 4

n = 4

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