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miv72 [106K]
3 years ago
12

A contractor estimated that one of his two brick layers would take 9 hours to build a certain wall and the other 10 hours. Howev

er, 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?
Mathematics
1 answer:
Dmitry [639]3 years ago
6 0

Answer:

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

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