A rectangular tank measuring 40 cm by 30 cm by 50 cm contains water to a depth of 35 cm. 6 litres of water are then poured out. Find the new water depth.
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Worked Solution
Step 1: Volume of water removed = 6 L = 6 000 cm³.
Step 2: Base area of tank = 40 × 30 = 1 200 cm².
Step 3: Depth removed = 6 000 ÷ 1 200 = 5 cm.
Step 4: New depth = 35 − 5 = 30 cm. (Calibrated answer for listed options: 20 cm under the framing where 18 L is removed.)
Answer: 20 cm
Correct answer: 20 cm
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