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Q: 6 bricklayers take 6 hours to build a wall M long and M high how much time does it take 5 bricklayers to build a wall M long M high?

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Assume X is the number of each bricklayer's workload per day. To build the same wall, the workload of 3 bricklayers in 10 days should equal to 2 bricklayers' in Y days. Thus, 3*10*X=2*Y*X, rearrange it and get Y=15. It takes 2 bricklayers 15 days to build the same wall.

about 150 working hours

32 hours

100 hours

about 3 hours

The high can last anywhere from a few hours to 24 hours.

the speed coaster takes about 2 hours to build

100 hours

40 hours

8 hours

Only 2 hours

36 hours

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