An aluminum sheet 25 cm long, 20 cm broad and 2 cm thick is melted into a cube. The difference in the surface area of the two solids would be
Question and options
An aluminum sheet 25 cm long, 20 cm broad and 2 cm thick is melted into a cube. The difference in the surface area of the two solids would be
- 130 cm²
- 435 cm²
- 290 cm²
- 580 cm²
Answer and explanation
Correct answer: D - 580 cm²
Volume = 25 x 20 x 2 = 1000, cube edge 10, SA 600. Sheet SA = 2(500+50+40) = 1180. Difference = 580 cm^2.
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