20. How many shots of 12. a 21. How many spheres of 2 cm diameter can be casted from a cubical piece of lead of (edge) 22 cm?
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Step-by-step explanation:
Radius of sphere = 1 cm.
Number of spheres = volume of cube / volume of sphere.
=l³/ 4/3*pi*r³
= 22³ / 4/3*22/7*1³
= 2541 spheres.
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