Answer:
10
Explanation:
25 - 5, 20 - 5, 15 - 5 = 10
x = every time he goes to target.
y = the amount he has left.
25 - 5x = y
After 3 trips, he will have 10 dollars left.
25 - 5(3) = y
25 - 15 = 10
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