2 Elementary School Math Questions! Urgent! School tomorrow

1 cheap yuan is equivalent to 15% of the pear, so, pear: yuan).

Apple: Yuan)2 Boys are 4 less than girls, that is, 24 boys are equivalent to 1-4 = 96% of girls, and 24 96% = 25 (people) of girls

4. A kilogram of apples is cheaper than a kilogram of pears, 15 cheaper, then (yuan 15) is the price of pears, so pears are 3 yuan, and apples (yuan.

5. The number of female students is: 24 (1-4%)=25 (person).

4. Pear: yuan).

Apple: Yuan) 5Girls: 24 (1-4%) 25 (people).

These are all to find the unit "1" first. There is also the corresponding amount, which is then calculated in columns. For example, the unit "1" in question 4 is a pear, and the unit "1" in question 5 is a girl.

4. One kilogram of pears.

Apples are a kilogram of dollars.

5. Female students 24 (1-4%) = 24 96% = 25. Let's do it!

Apple yuan, pear 3 yuan, 25 girls.

One kilogram of apples, one kilogram of pears is 3 yuan.

There are 25 girls.

If you use elementary school knowledge, it is the algorithm of unit one, but it is more difficult to understand, so you can try to solve the equation with the unknown number in junior high school.

1.The tax amount of this company is 10,000 yuan.

2.(1) (2600-2000-500)*10%+500*5%=10+25=35 yuan.

2) 3200-[(3200-2000-500)*10%+500*5%]=3200-(70+25)=3105 yuan.

3) 205-25=180；180/10%=1800；Uncle Zhang's salary income is 500 + 1800 + 2000 = 4300 yuan. The actual income is 4300-205=4095 yuan.

1. 21× 2.(1)500 100 25+10=35 (2)3200-2000-500=700 700 3200-70-25=3105 (3)1500 150+25 205 3000 205-175=30 30 200+4000=4200 4200-205=3995 Big brother, give a good review, I'm tired.

1. Solution: 10,000 yuan).

A: The tax amount of this computer company is 10,000 yuan.

12. (1) Solution: (2600-2000-500) 10 +500 5 = 35 (yuan).

A: A tax of $35 is payable.

2) Solution: 3200-(3200-2000-500) 10 -500 5 = 3105 (yuan).

A: Its actual income is 3,105 yuan.

3) Solution: [205-500 5 -(2000-500) 10] 15 + 2000 + 2000 = 4200 (yuan).

A: Its actual income is 4,200 yuan.

The third question of the 12 questions is more troublesome, so the teacher should pay more attention to it when teaching the questions.

1. The tax amount is: 10,000 yuan.

12. (1) (2600-2500) * 10% + (2500-2000) * 5% = 35 (yuan).

2) 3200 is divided into 2000 + 500 + 700 2000 is not taxed, 500 is taxed at 5%, and 700 is taxed at 10%.

3200-2500)*10%+(2500-2000)*5%=95 (yuan).

Actual income: 3200-95=3105 (yuan).

3) The tax charged at 10% is 205-25=180 yuan 180 10%=1800 between 501 and 2000 yuan, which meets the tax requirements. Uncle Zhang's salary in January is 2000 + 500 + 1800 = 4300 (yuan).

Its actual income is: 4300-205=4095 (yuan).

We really have the fate to do this topic today. Our teachers have a lot of homework, hey.

1.Solution: Suppose the pre-tax income of this computer company in October is x0,000, then the equation x-x*20%= is set by the title

x=21, so the company's tax payment is 21*20%=10,000.

2.Solution:1Liu Ming should pay 500 * 5% + (600-500) * 10% = 35 yuan.

2.Aunt Wang's tax payable is 500*5%+(1200-500)*10%=95 yuan.

So Aunt Wang's actual income is 3200-95=3105 yuan.

3.If the income is between 2000 and 2500, the maximum payment is 500*5%=25 yuan.

If the income is between 2500 and 4000, the maximum payment is 500 * 5% + 1500 * 10% = 175 yuan.

If the income is between 4000 and 7000, the maximum payment is 500 * 5% + 1500 * 10% + 3000 * 15% = 625 yuan.

Because 175< 205<625

Therefore, let's assume that Uncle Zhang's income in January is x(4000 columns, equation 500*5%+1500*10%+(x-4000)*15%=205

Get x = 4200 yuan.

So Uncle Zhang's actual income is 4200-205=3995 yuan.

The first question should be 10,000.

The second question is 60 yuan, the second question is 3080 yuan, and the third question will not be done!

Analysis: 450 chickens and ducks, if you buy 30 ducks, then there are 450 chickens and ducks + 30 = 480.

The inscription says that if half of the chickens are sold at this time, the chickens are twice as many as the ducks, and in the case of no chickens being sold, it means that the chickens in the 480 chickens are 2*2=4 times that of the ducks. So 480 was divided into five parts, and one was the number of ducks. It is also easy to find the number of chickens.

Solution: (450+30) (2x2+1) = 96 (current number of ducks) Number of chickens: 96 4 = 384.

Number of ducks: 96-30 = 66.

After selling half of the chickens, you buy 30 ducks, and the chickens are twice as many as the ducks, which means that the original chickens are four times that of the current ducks, and if you don't sell half of the chickens, then the chickens account for four-fifths of the total number of chickens and ducks (450 + 30 = 480) (480 5 * 4 = 384), and there are (450-384 = 66) ducks.

450 + 30 = 480 480x2 = 960 960 divided by 384 equals 384 so 384 chickens and ducks 450-384 = 66.

1. The tax amount is: 10,000 yuan.

12. (1) (2600-2500) * 10% + (2500-2000) * 5% = 35 (yuan).

2) 3200 is divided into 2000 + 500 + 700

2000 is not taxed.

500% tax is levied at 5%.

700 is taxed at 10%.

3200-2500)*10%+(2500-2000)*5%=95 (yuan).

Actual income: 3200-95=3105 (yuan).

The tax is charged at 10% or is the state of affairs.

205-25=180 yuan.

Between 501 2000 yuan, it meets the requirements of collecting tax from the bank. Uncle Zhang's salary in January is 2000 + 500 + 1800 = 4300 (yuan).

Its actual income is: 4300-205=4095 (yuan).

1. Confession: 10,000 yuan).

A: The tax amount of this computer company is 10,000 yuan.

12. (1) Solution: (2600-2000-500) 10 +500 5 = 35 (yuan).

Answer: A tax of 35 yuan should be paid.

2) Solution: 3200-(3200-2000-500) 10 -500 5 = 3105 (yuan).

Answer: Its actual income is 3,105 yuan.

3) Solution: [205-500 5 -(2000-500) 10] 15 + 2000 + 2000 = 4200 (yuan).

A: Its actual income is 4,200 yuan.

The third question of the 12 questions is more troublesome, so the teacher should pay more attention to it when teaching the questions.

Let the eldest spend $x, the second spend $y, and the third spend $z, with x=(y+z+65) 2, that is, 2x-y-z-65=0 (1)y=(x+z+65) 3 x-3y+z+65=0 (2).

z=(x+y+65) 4 x+y-4z+65=0 (3) The solution of the simultaneous equation yields:

x = 100 yuan, y = 75 yuan, z = 60 yuan, the four brothers spent a total of x+y+z+65=100+75+60+65=300 yuan.

Solution: Set up the boss, the old.

Second, the third child spent x, y, and z yuan respectively, then.

x=1/2(y+z+65)

y=1/3(x+z+65)

z=1/4(x+y+65)

x=100 for solving a system of ternary linear equations

y=75z=60

So the four brothers spent a total of 100 + 75 + 60 + 65 = 300 (yuan).

A mathematician's tombstone is engraved with the following passage: I had a happy childhood in the first seven years of my life, and I spent a quarter of my life studying after my childhood, after that, I got married, and after 5 years of marriage, I had a child, and I felt very happy, but unfortunately my child was only half of my time in the world, and after the child died, I spent 4 years in sorrow, and then ended my life.

Can you calculate the age of the mathematician and his children???

The eldest spent 1 share, the other three spent 2 shares, a total of 3 shares, the eldest accounted for one-third of the total, and so on, I learned: the second spent a quarter of the total, the third spent one-fifth of the total, the three people accounted for a total of 47/60 of the total, the fourth accounted for 13/60, and the total amount of money can be calculated by dividing the money spent by the fourth child by 13/60. 300 yuan.