In the second math problem of junior high school, a pool has one inlet tap and one outlet tap. If the two taps are opened for half an hour at the same time, the empty pool can be filled with water. For example, Guo can open ten taps at the same time A pool has one inlet tap and one outlet tap. If the two taps are opened for half an hour at the same time, the empty pool can be filled with water. For example, if Guo turns off the tap after opening for one tenth of an hour at the same time, the empty pool can also be filled after another quarter of an hour. How many hours can the ball open the inlet tap to fill the empty pool? Well, this chapter is about the real fractional equation!

In the second math problem of junior high school, a pool has one inlet tap and one outlet tap. If the two taps are opened for half an hour at the same time, the empty pool can be filled with water. For example, Guo can open ten taps at the same time A pool has one inlet tap and one outlet tap. If the two taps are opened for half an hour at the same time, the empty pool can be filled with water. For example, if Guo turns off the tap after opening for one tenth of an hour at the same time, the empty pool can also be filled after another quarter of an hour. How many hours can the ball open the inlet tap to fill the empty pool? Well, this chapter is about the real fractional equation!

Open the water inlet tap separately for X hours to make the water full and the water outlet tap for y hours
(1/x-1/y)*1/2=1
(1/x-1/y)*1/10+1/x*1/4=1
1/x*1/4=1-1*1/5=4/5
1/x=16/5
x=5/16
Open the water inlet tap separately for 5 / 16 hours to make the water full

Xiaofei's family used to use about 10 tons of water every month. After changing the faucet, they used about 9 tons of water every month,
How much less water is used each month
(submit within 15 points, if correct and quick, it will be the best answer)

How many percent less than the original is to divide the saved part by the original monthly water consumption
（10-9）÷10=10％