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Math application problems and answers in the first volume of the fourth grade
There are 240 junior students in bright primary school, 7/9 middle students and 2/3 senior students. How many seniors are there?

240×7/9÷2/3

=240×7/9×3/2

= 280 (person)

Column calculation

How much is 6/7 of 4/3 more than 1/2?

4/3×6/7-4/3× 1/2

=8/7-2/3

= 10/2 1

Xiaoming and Xiaohua * * * have 108 stamps. Xiaoming's stamps are four fifths of Xiaohua's. How many stamps do they have?

Xiaoming's stamps are five-quarters of Xiaohua's. Obviously, the stamp of Xiaohua is regarded as 1 unit. Xiaoming's share is 4/5. Just calculate the unit 1 first, and the unit 1 is the corresponding amount divided by the corresponding number of copies to get the unit 1. The corresponding amount here is 108 for Xiaoming and Xiaohua, and the corresponding number of copies is 1 4/5=9/5. So the unit 1 is the seal of Xiaohua. Xiaoming's is 108-60=48 yuan.

There are 60 students in class 6 1, and the number of boys is 7/ 12 of the whole class. After several girls transfer, the number of boys is 5/9 of the whole class. How many girls have been transferred?

The original number of boys: 60 x 7/ 12=35.

Class size of girls after transfer: 35 divided by 5/9= 63.

So the number of girls transferring: 63-60=3.

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