this equals 3/8=x/128; because to cross multiply you put the smallest as the numerator or as the denominator as lose as they are across from their corresponding parts so 3/8=x/128 is the same as 8/3=128/x
to solve: cross multiply (by multiplying numbers diagonal from them); then solve as simple equation
3/8=x/128 goes to... 8x=(3*128) 8x=384 then solve by dividing both sides by 8 x=48 so 48 of the vehicles are trucks
