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1. There are two piles of 900 bags of cement in a construction site. If 40 bags are taken from pile a and put into pile B, the cement in pile a is four times as much as that in pile B, and there is water in pile B How many bags of clay? 2. In a math exam of a certain class, the average score is 78. The average score of boys is 77, and that of girls is 81. How many times is the number of boys? 3. A factory wants to manufacture a batch of machine tools. It plans to produce 64 machine tools every day, which can be completed in 15 days. In fact, it completes the task three days ahead of schedule. How many more machine tools can be produced every day than planned?
2. 78-77=1 81-78=3 3÷1=3
There are two piles of 900 bags of cement in a construction site. If 40 bags are taken from pile a and put into pile B, the cement in pile a is four times that in pile B. how many bags of cement are there in pile B?
900 (4 + 1) - 40, = 180-40, = 140 (bags); a: there were 140 bags in pile B
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