There are 105 cars, 35 vans and 21 trucks on a vehicle show. Find the ratio of cars to motors to trucks in its simplest form.

There are 105 cars, 35 vans and 21 trucks, so the ratio should be 105:35:21. Then, find its simplest form:

105:35:21 = (105 ÷ 7) : (35 ÷ 7) : (21 ÷ 7) = 15:5:3

The ratio cannot be divided by any common factor. Such ratio is in its simplest form.