1。 This question seems difficult. In fact, another way of thinking is to use up the 500 yuan as much as possible, and then divide the prizes into 123 grades according to the value.

2. With the idea, we can observe that the most expensive Wenquxing is definitely important, and it is the first. 50 times 3 = 150 yuan

500- 150 yuan =350 yuan

3. Then consider the second place: you can try to choose football: then 40 times 4= 160 yuan, and now the money in hand is 350- 160= 190 yuan.

4. Consider the third place again: try the badminton racket: 35 times 6=2 10 yuan, obviously the money is not enough. Then try the calculator 22 times and 6= 132 yuan.

190 yuan-132 yuan =58 yuan.

The remaining 16 people in 58 yuan are about equal to 3 yuan, that is, each person can buy a pencil sharpener.

3 times 16=48 58-48= 10 yuan, and the remaining 10 yuan can consider buying 10 rubber for the students who won the second and third prizes respectively.

Summary: This kind of problem is very open, combined with practice, in short, the classification is clear, and the best use is made according to the actual situation.