Answer:
Step-by-step explanation:
Let the number of gallon sized bought be x, so the cost will be $15x.
2 quart sized cost $4, so cost is 2×$4 = $8
And: $15x + $8 = $53
15x = 53 - 8
15x = 45
x = 45/5
x = 9
so the answer is (15x3)+8
or you can just add 15, 3 times
so it would look like this
15+15+15=45
45+8=53
