Find the number of solid spheres, each of diameter \( 6 \mathrm{~cm} \) that could be moulded to...

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Find the number of solid spheres, each of diameter \( 6 \mathrm{~cm} \) that could be moulded to form a solid metal cylinder of height \( 45 \mathrm{~cm} \) and diameter \( 4 \mathrm{~cm} \).
a. 2
b. \( 20 / 4 \)
c. 5
d. 6
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