Class A and class B of grade 9 in Guangming Middle school donated the same amount of money for "Hope Project", both of which were more than 300 yuan and less than 400 yuan. It is known that one person in class a donated 6 yuan, and the others donated 9 yuan; one person in class B donated 13 yuan, and the others donated 8 yuan. What is the total number of students in class A and class B?

Class A and class B of grade 9 in Guangming Middle school donated the same amount of money for "Hope Project", both of which were more than 300 yuan and less than 400 yuan. It is known that one person in class a donated 6 yuan, and the others donated 9 yuan; one person in class B donated 13 yuan, and the others donated 8 yuan. What is the total number of students in class A and class B?

Suppose there are x people in class A and y people in class B. from the meaning of the question, we can get 6 + 9 (x-1) = 13 + 8 (Y-1), 300 < 6 + 9 (x-1) < 400, that is, y = 98x − 13323 < x < 4479, because x is an integer, so x = 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44

The students in class 1 and class 2 of grade 9 of a middle school donated money for "Hope Project". The total amount of donations of the two classes was the same, more than 300 yuan, but less than 400 yuan

The total amount of donation of the two classes is more than 300 yuan, but less than 400 yuan. One student in class 1 donated 6 yuan, and the others donated 9 yuan. One student in class 2 donated 13 yuan, and the others donated 8 yuan

12 cans of coke is 96 yuan, 40 cans per case is 300 yuan, 324 cans are needed. How to buy the cheapest?

If we say that we have to buy Coke in groups of 12 and 40, we should try our best to buy Coke in groups of 40. 324 cans are allocated into 7 groups of 12. When we buy Coke in groups of 6 and 40, the number of coke in groups of 40 is the most
A total of 7 * 96 + 6 * 300 = 2472 yuan