Wall thickness

The hollow metal ball has an outside diameter of 40 cm. Determine the wall thickness if the weight is 25 kg and the metal density is 8.45 g/cm³.

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You need to know the following knowledge to solve this word math problem:

algebra
expression of a variable from the formula
arithmetic
cube root
third power
solid geometry
sphere
units
mass
unit conversion
density
volume
9th grade (14y)
high school

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