A tap fills a tank at 15 litres per minute. After 8 minutes, a second tap is turned on that drains the tank at 6 litres per minute. How many litres are in the tank after another 12 minutes?
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Worked Solution
Step 1: Calculate litres filled in the first 8 minutes (only fill tap on).
15 × 8 = 120 litres
Step 2: Find the net rate when both taps are on.
Net rate = 15 − 6 = 9 litres per minute
Step 3: Calculate litres added in the next 12 minutes.
9 × 12 = 108 litres
Step 4: Total in tank.
120 + 108 = 228 litres
Correct answer: 228 litres
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