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12000=0.01328*20^2*V^3       solve for V

Divide both sides by   0.01328*20^2

12000 / ( 0.01328 * 20^2)  =  V^3       take the cube root of both sides

[12000 / ( 0.01328 * 20^2)]^(1/3)  =  V  ≈  13.12