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The question given below has-been taken from the past examination of IGCSE Mathematics Paper taken in May/June 2009
(0580/M/J/qp/4/
One metal bar, of volume 4840 cm³, is melted down to make 4200 identical small spheres.
All the metal is used.Calculate the radius of each sphere.
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4840/4200cm³
1.15cm³ = volume of each sphere ball
1.15cm³ = 4/3 πr³
0.2745cm³ = r³
0.65cm = r