Question

How many silver coins, 1.75 cm in diameter and of thickness 2 mm, must be melted to form a cuboid of dimensions

5.5 cm × 10 cm × 3.5 cm?


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Answer 1

Answer:

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Answer 2

$\huge \bold {\underline{ＡＮＳＷＥＲ}}$

Radius of coin = 0.875cm , height = 0.2 cm

Dimensions of cuboid $= 5.5 cm \times 10 cm \times 3.5 cm$

Volume of coin

$= \pi r²h$

$= \pi \times 0.875² \times 0.2$

$\fbox {= 0.48125 cm²}$

Volume of cuboid $= 5.5 cm \times 10 \times 3.5 \\\\\ \fbox{= 192.5 cm³}$

Number of coins

$= \frac {192.5}{0.48125} \\\\\ \fbox{= 400 }$