(a)[2]
Write the ratio of cars to vans to trucks in lowest terms.
(b)[2]
Trevor decides that his collection of vehicles has become too large, so he sells $c$ cars, $v$ vans and $t$ trucks. After the sale, the ratio of cars to vans to trucks is $2:2:1$. Find $c$, $v$ and $t$, given that he has sold at least one of each type of vehicle and that the total number sold is as small as possible.