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Four application problems of fifth grade math scores
1、

The number of male workers in a workshop is 5/4 of the number of female workers, and then two female workers are transferred. Now the number of male workers is six fifths of that of female workers. How many male workers are there in this workshop now?

2、

Fruit shop apples and pears 1300 Jin, sold two-fifths of the apples. After selling 20 Jin of pears, the quality of the remaining pears is exactly the same as that of apples. How many kilograms are apples and pears?

3、

For a stake, cut off 1/2 of the total length for the first time, the remaining 1/3 for the second time, the remaining 1/4 for the third time and the remaining 1/5 for the fourth time. At this time, the stake is still 6 cm. What is the total length of the stake?

4、

There is a bumper harvest in tomato fields this year. On the first day, I collected all 3/8, and there were three baskets left 12 Jin. The next day, I packed all the rest, just six baskets. How many kilograms of tomatoes have been harvested in this land?