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Mathematics, 24.03.2020 20:52 tati7149
A contractor estimated that one of his two bricklayers 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 got 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 it contain?
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A contractor estimated that one of his two bricklayers would take 9 hours to build a certain wall an...
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