A contractor estimated that one of his two brick layers would take 9 hours to build a certain wall and the other 10 hours. However, he knew from experience that when they worked together, 10 fewer bricks were laid per hour. Since he was in a hurry, he put both men on the job and found it took exactly 5 hours to build the wall. How many bricks did the wall contain?

Question

19 December, 04:33

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Answers (1)

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Antonio Garcia · Answer 1

900

Step-by-step explanation:

Assume x brick

X * (1／9+1/10) 一 10=X/5

X (19/90-1/5) = 10

X * (1/90) = 10

X=900