WAEC Mathematics 2023 Objective — Question 23
Question 23 of 50 from the West African Examinations Council (WAEC) Mathematics 2023 Objective paper, with the correct answer and a full explanation.
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An empty cylindrical tank is 140 cm in diameter. If 200 litres of water is poured into the tank, calculate, correct to the nearest centimetre, the height of water in the tank. [Take π=22/7]
- A. 91 cm
- B. 57 cm
- C. 13 cmCorrect
- D. 7 cm
Explanation
Volume of water=200×1000=200,000 cm³. Radius=70cm. Using V=πr²h: 200,000=(22/7)×70×70×h → h=200,000×7/(22×70×70)≈13cm.
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