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Q.

The number of coins, each of radius 0.75 cm and thickness 0.2 cm to be melt to make a right circular cylinder of height 8 cm and base radius 3 cm is

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a

460

b

500

c

600

d

640

answer is D.

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Detailed Solution

Number of coins =volume of cylindervolume of coins  =πr12h1πr22h2=3×3×80.75×0.75×0.2=640
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The number of coins, each of radius 0.75 cm and thickness 0.2 cm to be melt to make a right circular cylinder of height 8 cm and base radius 3 cm is