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How many coins of 1 cm in diameter and thickness of 1.2 cm need to be melted to form a cuboid with dimensions of 5 cm × 10 cm × 4 cm?(a) 193(b) 213(c) 184(d) 282This question was addressed to me during an online exam.This interesting question is from Conversion of Solid from One Shape to Another in division Surface Area and Volumes of Mathematics – Class 10

Answer»

Correct choice is (B) 213

Explanation: VOLUME of the CUBOID = NUMBER of coins(volume of a coin)

lbh = number of coins(πr^2h)

5 × 10 × 4 = number of coins(3.14 × 0.5^2 × 1.2)

200 = number of coins(0.94)

number of coins = 213



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