1. Li Qian compiled a fairy tale book with a total of 2007 numbers. How many pages does this book have? 2. Five referees give a gymnast the average score of 9.38 after removing one of the highest and lowest points. If one of the lowest points is removed, the average score is 9.46. If one of the highest points is removed, the average score is 9.26?

1. Li Qian compiled a fairy tale book with a total of 2007 numbers. How many pages does this book have? 2. Five referees give a gymnast the average score of 9.38 after removing one of the highest and lowest points. If one of the lowest points is removed, the average score is 9.46. If one of the highest points is removed, the average score is 9.26?

2007 divided by 2 = 1003.5
There are 1004 pages in the book
9.46 *4-9.38*3=9.7
9.26 *4-9.38*3=8.9
The highest score was 9.7
The lowest score was 8.9

Xiaolan makes two cups of brown sugar water. The first cup contains 10 grams of brown sugar and 200 grams of water, and the second cup contains 300 grams of water. If the ratio of brown sugar and water in the first cup is used, how many grams of brown sugar should be added in the second cup?
Xiaolan made two cups of brown sugar water. The first cup contains 18 grams of brown sugar and 200 grams of water. The second cup contains 300 grams of water. If the ratio of brown sugar and water in the first cup is used, how many grams of brown sugar should be added in the second cup?
Sorry to send the wrong number

10÷200×100%=5%
300×5%=15
Put 15g brown sugar in the second cup

When 20 g brown sugar is dissolved in 105 g water, it is found that the sugar water is too light. How much sugar will increase the sugar content to 20%?

Let's add x grams of sugar
（20+x）/（20+105+x）=20%
We get x = 6.25

A math problem for children
A barrel of oil weighs 5.6kg. After half use, there is still 3.2kg left. How many kilos does the barrel weigh

Barrel + oil = 5.6kg
Barrel + 1 / 2 oil = 3.2kg
Subtraction, 1 / 2 oil = 2.4kg
The oil weighs 4.8kg
Barrel weight 5.6-4.8 = 0.8kg
It can be solved by equation