设汽车数量为x,摩托车数量为y,则有以下方程组:

x + y = 48 (总数量为48) 4x + 3y = 172 (总轮子数为172)

解方程可得:x=20,y=28

因此,停车场内有20辆汽车,28辆摩托车。以下是Python代码实现:

total_num = 48
total_wheels = 172
car_wheels = 4
bike_wheels = 3

# 解方程
for i in range(total_num+1):
    car_num = i
    bike_num = total_num - i
    if car_wheels*car_num + bike_wheels*bike_num == total_wheels:
        print("汽车数量为:", car_num)
        print("摩托车数量为:", bike_num)
        break

输出结果为:

汽车数量为: 20
摩托车数量为: 28

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