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How to find the mass of a baseball?

A standard baseball has a circumference of approximately 23cm. If a baseball has the same mass per unit volume as a neutron or a proton, about what would its mass be?

Some info:

Mass of Proton/Neutron: 10^-27 kg

Length of Proton/Neutron: 10^-15m (diameter)

I know I have to convert the diameter of the proton/neutron to its circumference, after that I'm not sure if I divide its mass to its length and then multiply by the circumference of the ball or not.

TY

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