Send each letter 0.6 yuan, there are n letters need y yuan to list the function relationship, find the range of independent variable n is equal to 0

Send each letter 0.6 yuan, there are n letters need y yuan to list the function relationship, find the range of independent variable n is equal to 0

y=0.6n
N is a natural number

It is known that the selling price of an evening paper is 0.50 yuan per copy, and Y represents the total price of X newspapers sold, then the functional relationship between Y and X is?
Beijing Normal University Edition
School is about to begin

y=0.5*x

The unit price of a newspaper is 1.50 yuan. The total price of X copies of this newspaper is y (yuan), which is a function of X

y=1.5x

The school will hold a parents' forum, with 45 participants. They will prepare 200 ml of drinks for each person. Please figure out which shopping mall to go to
Big bottle drinks 1200 ml, 10 yuan per bottle, small can drinks 200 ml, 2 yuan per bottle

Choose C 45x200 = 9000, buy seven big bottles and three small bottles, 70 + 6 = 76 yuan, 20% off, 76x0.8 = 60.8 yuan

A bottle of beverage, the first time I drank 200 ml, the second time I drank the remaining 3 / 4, at this time there is still 50 ml in the bottle, how many ml of beverage is there in the original bottle?

50÷(1-3/4)+200=400

On Sunday, Xiao Ming and seven classmates, a total of 8 people, went on a trip. On the way, he used 20 yuan to buy drinks. The shop 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 spent, how many ways can he buy? How many cups of coke and milk tea are there in each way?

First, there are four kinds of milk tea: one bottle of coke and six cups of milk tea; four bottles of coke and four cups of milk tea; seven bottles of coke and two cups of milk tea; ten bottles of coke and zero cups of milk tea. Second, there are the two schemes in the middle

On Sunday, Xiao Ming and eight of his seven classmates went on an outing together. 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 for each person to buy a drink, how many cups of coke and milk tea did Xiao Ming buy?

It's all four

On Sunday, Xiao Ming and seven classmates, a total of eight people, went on a trip. 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, how many milk tea can you buy when each person has at least one drink?

Four cokes, four milk teas
Set the number of people who drink Cola as X and the number of people who drink milk tea as y~
2X+3Y=20
X+Y=8
Y=8-X
2X+3(8-X)=20
2X+24-3X=20
X=24-20=4
Y=8-4=4

A store sold 190 bottles of drinks a day. The black currant flavor is three times as much as the orange flavor, and there are 10 more bottles. Q: how many bottles do you sell?

Black currant flavor sold 145 bottles, 45 bottles of orange flavor
Let the orange taste be X
x+3x+10=190
4x=180
x=45
45 * 3 + 10 = 145 bottles

The store sells 480 bottles of drinks in the morning, 1 / 4 more than in the afternoon. How many bottles of drinks do they sell in the afternoon?

360.480×(1-1/4)=360