Answer:
18 cars
Step-by-step explanation:
50 +20x ≥ 399
Subtract 50 from each side
50 -50 +20x ≥ 399-50
20x ≥349
Divide each side by 20
20x/20 ≥349/20
x ≥17.45
Since x is cars we round up to the nearest whole number
x = 18 cars
