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Question: Can't get rid of those fractions - help a noob please!

Question:Can't get rid of those fractions - help a noob please!

vroomZOOM 15 Maple 2020
syntax
October 05 2020
2

Hello

Just started out with maple. 

I entered a function that looks like this, to find the volume of a sphere: V := (4*Pi(d/2)^3)/3

then I use the eval command like this: eval(V, d = 6.35*mm)

and I get this:(4*Pi(3.175000000*mm)^3)/3

Anything I tried, maple doesn't want to spit out one number! I just need what that is equal to, I don't need an expression with Pi. Spent over two hours trying to figure it out, watching videos etc but no luck! hoping that someone can help me with this!
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