Answer:
x = 3
Step-by-step explanation:
ok, so in this case we need to create an equation, we can do this based on the info u were given,
-it mentions "per customer" since the amount of customers is unknown we will replace that with x, 13 per customer, 13 per x so that would be 13x and it should equal the total 39 so the equation would be
13x=39
next, we need to solve and get x alone
-start by doing the opposite and dividing 13 by everything
13/13=0 it crosses out
39/13=3
so in this case, x = 3
