If the unit price of a newspaper is a yuan per copy and X is the number of copies of the newspaper, then the relationship between the total price of the newspaper y (yuan) and X is () () independent variable

If the unit price of a newspaper is a yuan per copy and X is the number of copies of the newspaper, then the relationship between the total price of the newspaper y (yuan) and X is () () independent variable

y=ax

When buying a pencil, the unit price is 0.2 yuan, and the total price is y yuan, which changes with the number of pencils X. constant and variable, independent variable and function are pointed out, and the relationship of function is written
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The formula is y = 0.2x
Constant 0.2 variable x y
Independent variable x
Function y

For some pencils, the unit price is 0.2 yuan / piece, and the total price is y yuan, which varies with the number of pencils. The variable and constant light, independent variable and function are pointed out, and the expression of the relationship between function and independent variable is written

Variables are: number of pencils and total price
Constant is: unit price
The number of pencils is an independent variable, and the total price is a function of the independent variable,
The relation between the function and the independent variable is y = 0.2x, (x is the number of pencils)

Buy some pencils, the unit price is 0.2 yuan, the total price is y yuan with the number of pencils x change, point out the constant and variable

The constant is that the unit price of a pencil is 0.2 yuan
The variables are y yuan and X pencils

The owner of the food store bought 240 popsicles. On the first day, 13 popsicles were sold. On the second day, 14 popsicles were sold? （　　）
A. 20B. 80C. 60D. 100

According to the meaning of the question: 240-13 × 240-14 × 240 = 240-80-60 = 100 (sticks), there are still 100 sticks not sold

1. There are 500 cases of drinks in the store, 20% of the total number sold on the first day and 30% of the total number sold on the second day. How many cases of drinks are left in the store?

500×(1－20%－30%)=500×50%=250

The store bought a batch of drinks, including 25 cases of coke, 24 bottles in each case, accounting for 2 / 5 of the total number of drinks, and soda water accounts for 3 / 50 of the total number of drinks. How many bottles of soda water are there?
Why is 600 bottles of coke divided by two fifths equal to the total number of drinks
600 bottles of coke divided by two fifths is the total number of drinks
According to what formula?

Because 25 × 24 = 600 bottles of coke
2 / 5 of all beverages
600 △ 2 / 5 = 1500 bottles is the total number of drinks
1500 × 3 / 50 = 90 bottles is the number of deed tax bottles
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Xiao Ming drank 25% of this bottle of beverage on the first day, and one third of it on the second day, with 0.5 kg left. How many kg is this bottle of beverage?

Think of this drink as a unit "1":
0.5 △ 1-25% - 1 / 3 = 0.5 △ 5 / 12 = 1.2 (kg) Corresponding quantity / corresponding percentage = Unit "1"
A: This drink is 1.2kg

The store brought in a batch of drinks, including 25 cases of coke, 24 bottles in each case, accounting for 2 / 5 of the total number of drinks, and soda water accounts for 3 / 50 of the total number of drinks. How many bottles of soda water are there?
.,.,.,.,

25 times 24 equals 600. Divide 600 by two fifths to get the total, and get 1500. Then multiply 1500 by three fifths to get the result, 90

On Sunday, Xiao Ming and seven classmates, a total of 8 people, went on an outing. On the way, he spent 20 yuan to buy drinks. The store only had coke and milk tea. It is known that coke costs 2 yuan a cup and milk tea costs 3 yuan a cup. If 20 yuan is just used up. (1) how many ways to buy? How many cups of cola and milk tea in each way? (2) When each person has at least one drink and at least two milk teas, how many ways to buy them?

(1) Let's buy Coke and milk tea as X and Y cups respectively. According to the meaning of the question, we get 2x + 3Y = 20 (and X and y are natural numbers) 2x = 20-3y, x = 10-32y  x = 10Y = 0, x = 7Y = 2, x = 4Y = 4, x = 1y = 6. So there are four ways to buy Coke and milk tea. The number of cups in each way is ① 10, 0; ② 7, 2; ③ 4, 4; ④ 1