Question 23
Mensuration of SolidsAn empty cyclindrical 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 cm
- D.7 cm
Show the answer and explanation
Answer: C (13 cm)
Explanation
200 litres = 200 000 cm³ and r = 70 cm. h = 200 000 ÷ (22/7 × 70 × 70) = 200 000 ÷ 15 400 ≈ 12.99, so about 13 cm.