Aschool bus uses 34 of a tank of gas to drive back and forth to school in a week with 5 school days. how much gas does the bus use to drive back and forth to school in a week with 4 school days? write your answer in simplest form.

  I am assuming Michael's interpretation is correct, that you want to find how much gas is used in 4 days knowing how much is used in 5 days.  Set up a simple proportion and solve it:

 3/4 tank → 5 days

 x tank → 4 days

 x = 4 * (3/4) / 5 = 3/5 of a tank

 In 4 days you use 3/5 of a tank.

Jared is correct because if you substitute a random number in for x 2 for example

2+10=12

2-10 doesn’t =12