Water flows back and forth between a small and large tank. When water is moving into a tank the flow rate is positive, and when water is moving from a tank the flow rate is negative. Each tank begins with 250 gallons of water. The flow rate for the large tank is recorded as negative 6 gallons per minute. After a period of 25 minutes, which integer represents the amount of water left in the large tank?
The large tank starts with 250 gallons. A rate of −6 gallons per minute means 6 gallons leave the tank each minute, so over 25 minutes the change is −6 × 25 = −150 gallons. The amount left is 250 − 150 = 100 gallons, so the correct choice is A, 100.
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