Answer:
see below
Step-by-step explanation:
First, she should subtract 6 from both sides of the inequality. This makes it so that the x terms are on one side and the non-x terms are on the other side so she can then solve for x by multiplying the entire inequality by 2.
x= cost per gallon
10x=23
x=2.3
2.3*15= 34.5
Answer: 30 cents