2020 · Q67
How many solid lead balls each of diameter 2 mm can be made from a solid lead ball of radius 8 cm?
Elementary MathematicsMensuration
- A512
- B1024
- C256000
- D512000
Explanation
The count is the ratio of volumes: (80/1)^3 = 512000 balls. Hence option (D). Equivalently the volume ratio is (8 cm / 1 mm)^3 = 80^3.