Calculate the unit price, 25 yuan = 250 angle, 250÷6 is about 4 1 angle, and the other four angles, 4 1 angle is 4. 1 yuan, and 20 ÷ 4 = 5 yuan. Compared with the unit price, it is 4. 1 yuan, less than 5 yuan.

Design scheme: 5× 6 = 30 people, 2× 4 = 8 people, 30+8 = 38 people, rent 5 vans, 2 taxis, 4. Calculate the price. Five vans 5× 25 = 125 yuan, two taxis 2× 20 = 40 yuan, total price 125.

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The role of mathematical problems:

1, for students: test students' mastery of mathematics and prescribe the right medicine.

2. For the field of mathematics: it can evolve into mathematical conjecture and mathematical theorem.

3. For other disciplines: you can turn the topics of physics and other sciences into mathematical problems and solve them by mathematical methods.