Eight people go for an outing and spend 20 yuan to buy Coke and milk tea. It is known that coke costs 2 yuan and milk tea costs 3 yuan. If 20 yuan is just used up, there are several ways Using the system of linear inequalities of one variable to solve

Eight people go for an outing and spend 20 yuan to buy Coke and milk tea. It is known that coke costs 2 yuan and milk tea costs 3 yuan. If 20 yuan is just used up, there are several ways Using the system of linear inequalities of one variable to solve

There are three kinds, the first kind of milk tea is 2 cups, coke is 7 cups. The second kind of milk tea is 4 cups, coke is 4 cups. The third kind of milk tea is 6 cups, coke is 1 cup

Shampoo 15 yuan per bottle, shopping malls to carry out promotional activities, buy 2 bottles get 1 free. Buy 2 bottles at a time, how much cheaper per bottle?

One bottle is 15 yuan, four bottles is 15 * 4 = 60 yuan, one bottle for free, that is to say, five bottles are bought for 60 yuan, so it is equivalent to 60 / 5 = 12 yuan per bottle, that is, 15-12 = 3 yuan per bottle, 15-15 * 4 / 5 = 3 yuan per bottle

A supermarket is engaged in "buy 4 get 1 free" promotional activities, the teacher to buy milk for 50 students, each bag. Now need to buy how many bags is enough

40 bags Buy 4 give 1 is equal to the original money to buy 5 bags, now as long as you buy 4 bags of money, that is to spend 4 / 5 of the original money, 50 × (4 / 5) = 40 bags