Question
The number of coins of radius 0.75 cm and thickness 0.2 cm to be melted to make a right circular-cylinder of heigh 8 cm and base radius 3 cm is :
Answer: Option D
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Volume of one coin = `(22/7 xx 75/100 xx 75/100 xx 2/10) cm^3 = 99/280 cm^3`
Volume of larger cylinder = `(22/7 xx 3 xx 3 xx 8) cm^3`
`:.` Number of coins = `((22 xx 9 xx 8)/(7) xx 280/99)` = 640.
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