Question

I only need the answer FAST​

Answer 1

Cars: 1 2 3

Trucks: 4 8 12

1 : 4 = 2 : x

4 · 2 = 1 · x

8 = x

1 : 4 = x : 12

4 · x = 1 · 12

4x = 12

x = 12 ÷ 4

x = 3