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A car with 20 people can take a van with 4 people and a van with 6 people. How can I rent a car when every car is full?
Let X car and Y car have a column equation of 4x+6y=32.
Because the number of cars is an integer, the solution of the indefinite equation is:
x=8
y=0
x=5
y=2
x=2
y=4
A: There are three car rental schemes: 8 cars and 0 carts; 5 cars, 2 trolleys; Two cars and four trolleys.