The tollway system tracks the number of cars to the number of semi i trucks that pay tolls. in june 2013 the ratio of cars to trucks was 7 to 3. if there were 600 more cars than trucks, how many trucks paid a toll in june 2013?
\(\dfrac{c}{t} = \dfrac{7}{3} \\ \dfrac{t+600}{t}=\dfrac 7 3 \\ 3t+1800 = 7t \\ 4t = 1800 \\ t=450\)
