The parking lot has 5/6 as many vans as trucks. What equation can be use to show the number of vans?

Just "translate" 5/6 as many vans as trucks

vans = (5/6)trucks
or
6vans = 5trucks

Suppose there are 18 trucks, then the number of vans = (5/6)(18) = 15

what is 15/18 ?