I suspect 4/2 should actually be 4/3, since 4/2 = 2, while 4/3 would make V the volume of a sphere with radius r. But I'll stick with what's given:
In Mathematica, you can check this result via
D[4/2*Pi*r^3, r]
there are 20 children in the cast of a class play, and 8 of the children are boys. of the boys, 4 have speaking part in the play
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