A. There are 84 people in class B and 58 people in class A and class B. how many people are there in class a

A. There are 84 people in class B and 58 people in class A and class B. how many people are there in class a

40 people

How to use the collocation method to solve the problem of quadratic equation of one variable: the square of unknown number m minus 7 / 3 times m is equal to 2, the process of solving the problem and the answer, thank you!

m²-7/3×m=2====>m²-2×7/6×m+(7/6)²-(7/6)²=2
====>(m-7/6)²=2+49/36=(11/6)²
====>m-7/6=±11/6
====>m=7/6±11/6
====>M = 3 or 2 / 3

During the promotion period of a shopping mall, it is stipulated that all goods in the shopping mall are sold according to 80% of the price. When customers spend a certain amount of money in the shopping mall, they can get the corresponding amount of lottery tickets according to the following scheme. (lottery shopping no longer enjoys preferential treatment) the price is x (yuan) 100 ≤ x < 200200 ≤ x < 400400 ≤ x < 600 The amount of lottery ticket (yuan) 50100150 If the price of the goods Mr. Hu bought in the shopping mall is 450 yuan, what is the discount______ Yuan

The answer is: 100

Tan @ is 58 △ 73. What's the value of @?

38.5 degrees

Math problem (with unknown x)
The total weight of a and B bottles of oil is 450 kg. When 100 kg is poured out of B bottle, the oil in a bottle is 30 kg more than that in B bottle. How many kg is there in B bottle now?

Let's say bottle B now has x kg
3x+x+30=450-100
x=80
A

During the promotion period of a certain market, it is stipulated that all commodities in the market are sold at 80% of the price,
At the same time, when customers spend a certain amount of money in the mall, they can get the corresponding amount of lottery tickets according to the following scheme. According to the above promotion method, customers can get double discounts when shopping in the mall. For example, if they buy goods with a price of 450 yuan, the consumption amount is 450 × 80% = 360 yuan, The amount of discount is 450 × (1-80%) + 30 = 120 yuan. Suppose that the discount rate for purchasing the commodity is equal to the amount of discount for purchasing the commodity and the price of the commodity
Q: a customer's consumption amount is between 400 yuan and 500 yuan, and the discount is 180 yuan. What is the price of a product?

(1) According to 80% of the list price, the actual consumption of 1000 yuan goods is 1000 × 0.8 = 800 yuan
Because 700 ＜ 800 ＜ 900, the amount of lottery ticket is 130 yuan, and the total discount is 1000 × (1-20%) + 130 = 330 yuan
So the discount rate = the amount of discount obtained by purchasing goods △ the price of goods = 330 / 1000 = 0.33 = 33%
(2) Because 500 × 80% = 400, 800 × 80% = 640, the actual consumption is between 400 and 640 yuan
① If the consumption amount a ranges from 400 to 500 yuan, then the price range is from 500 to 625 yuan
Set the price as X Yuan, 500 ≤ x ＜ 625
At this time, the discount is 0.2x + 60 yuan
Discount rate = (0.2x + 60) / x = 1 / 3
So x = 450
450 is not in the range of 500 to 625, so it is omitted
② If the consumption a ranges from 500 to 700, the price range is 625 to 800
Set the price as X Yuan, 625 ≤ x < 800
At this time, the discount is 0.2x + 100 yuan
Discount rate = (0.2x + 100) / x = 1 / 3
So x = 750
In this case, X is between 625 and 800
To sum up, customers can get 1 / 3 discount rate when they buy goods with a price of 750 yuan

27×7×58×36＝?

381024

The solution equation is: 8 / x = 0.9 / 4.5 12:15 = 2x

8 of x = 0.9 of 4.5
X = 4.5 × 8 in 0.9
x=40
12:15=2x
2x=12/15=4/5
x=4/5÷2
x=2/5

If a product is reduced by 20% during the promotion period, it can only be restored to its original price by another 25%
Right or wrong

Yes. (1-20%) * (1 + 25%) = 1

How many square meters is one cent of land

Equal to 0.1 Mu = 66.6 square meters