Question 6
Mensuration of SolidsA market woman sells oil in cylindrical tins 10cm deep and 6cm in diameter at N15.00 each. If she bought a full cylindrical jug 18cm deep and 10cm in diameter for N50.00, how much did she make by selling all the oil?
- A.N62.50
- B.N35.00
- C.N31.00
- D.N25.00
Show the answer and explanation
Answer: D (N25.00)
Explanation
Tin volume = π × 3² × 10 = 90π; jug volume = π × 5² × 18 = 450π. The jug fills 5 tins, which sell for 5 × N15 = N75, so she makes N75 − N50 = N25.