2022 · Q85
A square copper plate of side 16 cm weighs 128 gm. A circular disc of diameter 14 cm is cut off from the plate. What is the weight of the remaining part? (π = (22)/(7))
Elementary MathematicsMensuration
- A48 gm
- B49 gm
- C50 gm
- D51 gm
Explanation
Density = 128/256 = 0.5 g/cm²; the disc area is (22/7)×49 = 154 cm², weighing 77 g. Remaining weight = 128−77 = 51 g. The keyed option is D.