In the fourth grade, the next volume of mathematics exercises a topic in each class.
Solution: Lianhua Supermarket: 2.3*3=6.9 (RMB), that is, 6.9 yuan can buy (3+ 1)=4 boxes of yogurt. You need to buy 15 boxes: 15/4 = 3...3 (boxes), and you can also get one box if you buy the remaining three boxes. That is to say, you can buy 16 boxes of yogurt for 4 6.9 yuan. Small: 6.9*4=27.6 (RMB) Guangming Supermarket: 66.