A cylindrical glass with a bottom circumference of 3.14 decimeters contains some water, which accounts for 23% of the capacity of the glass. Put two eggs of the same size into the glass and immerse them in the water. At this time, the water surface rises by 8 cm, just level with the mouth of the glass. How much is the volume of an egg and the capacity of the glass?

A cylindrical glass with a bottom circumference of 3.14 decimeters contains some water, which accounts for 23% of the capacity of the glass. Put two eggs of the same size into the glass and immerse them in the water. At this time, the water surface rises by 8 cm, just level with the mouth of the glass. How much is the volume of an egg and the capacity of the glass?

The height of the cup is: 8 ^ (1-23) = 8 ^ (13) = 8 × 3 = 24 (CM) 3.14 decimeter = 31.4cm 3.14 × (31.4 ^ 3.14 ^ 2) 2 × (8 ^ 2) = 3.14 × 52 × 4 = 3.14 × 25 × 4 = 314 (CC) 3.14 × (31.4 ^ 3.14 ^ 2) 2 × 24 = 3.14 × 52 × 24 = 3.14 × 25 × 24 = 1884 (CC). A: the volume of a chicken egg is 314cm, and the capacity of the cup is 1884cm

There are 45 students in class one of grade six. In the math exam again, the average score of the whole class is 91.2 points, among which the average score of girls is 92 points
The average score of boys is 90. How many more boys than girls?

Set X for boys and 45-x for girls
45X91.2=92X（45-x）+90.5x
The solution is x = 24 for girls and 21 for girls
There are three more men than women

1. There are 40 students in class 2 of grade 6. 36 of them are qualified in one math practice, and 10 of them are excellent. What is the pass rate and excellent rate of this class?
2. There are 40 students in a class on Monday, two of them are sick. How about the attendance rate of the class on this day?
3. A certain kind of milk powder contains 28% fat. How many grams of fat does 400 grams of milk powder contain?
20% discount is the original price___ 25% off___ 50% off___ .
5. The real estate agent will sell the house with the cost of 400000 yuan for 500000 yuan, and the profit rate?
6. The purchase price of a certain garment is 80 yuan. If it is sold at a profit rate of 30%, how much is the selling price?
7. What is the selling price and loss rate of a commodity with a purchase price of 100 yuan and a 20% discount?
8. The cost of a commodity is 200 yuan. If the loss rate is 20%, how much is the selling price of the commodity?
9. Xiaoming's mother deposits 20000 yuan in the bank for two years, with an annual interest rate of 2.25%. When it matures, she needs to pay interest tax at the rate of 20%. How much interest does Xiaoming's mother actually get? What is the sum of capital and interest

1. Qualified rate 36 / 40 * 100% = 90%, excellent rate 10 / 40 * 100% = 25%
2、（40-2）/40*100%=95%
3、400*28%=112
4、0.8 0.75 0.5
5、(50-40)/40*100%=25%
6、80*（1+30%）=104
7、100*0.8=80 (100-80)/100*100%=20%
8、200*（1-20%）=160
9、20000*2.25%*2*(1-20%)=720
20000+720=20720