Answer: 105 chips
Explanation:
minute 1: 15 chips
minute 2: 30 chips
minute 3: 45 chips
minute 4: 60 chips
minute 5: 75 chips
minute 6: 90 chips
minute 7: 105 chips
or you could do 15 x 7 = 105
105 chips in 7 minutes
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