Seek primary school mathematics fifth grade application question 10, thank you!

2. A shoemaking factory produces 3860 pairs of men's shoes, twice as many as women's shoes, and how many pairs of women's shoes are made. 3. A canal has been repaired 840 meters, but there are still 120 meters left to be repaired, which is several times as many as it has not been repaired

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3. There are four children. One of them is one year older than the other. The product of the four ages is 360. How old is the biggest one?
4. The rated power of a clothes dryer with voltage of 220 V and 50 Hz is 1000 W. how many kilowatts of electricity do you need in three hours
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20. A rectangular sink, measuring 24 decimeters long and 8 decimeters deep. If 360 liters of water is poured into the water distiller's grains, how deep is the water in the water distiller's grains? (use equation to solve 0