Test site: the application of one-dimensional linear inequality

Special topic: Scheme type.

Analysis: Let B and C rent A and B respectively. Then, according to two cases: type A rent 1 or two cars, the equations are discussed.

Solution: Solution: Let's assume two kinds of cars, B and C, and rent A and B respectively.

① When Type A rents 1 car, there are

30a+ 10b= 150-50，

3a+b= 10。

A and b are integers,

Then a= 1, b=7 or a=2, b=4 or a=3, b = 1.

(2) When Type A rents 2 cars, there are

30a+ 10b= 150-50×2，

3a+b=5。

A and b are integers,

Then a= 1 and b = 2.

To sum up, there are four kinds of * * *.

So choose B.

Comments: First of all, this question should consider two cases of model A. 。

Can list the binary linear equation according to the meaning of the question, and then analyze it according to the fact that the number of cars is an integer.

I wish the landlord unlimited money and everything is awesome!