exam Maths Puzzle Numerical Ability

The volume of a sphere is a function of the radius of the sphere. Write a function for the volume of a ball. Evaluate the function for a volleyball of radius 10.5.

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exam Other Question

The diamerter of the Mily Way disc is approximately 9 x 10^20 meters. How long does it take light, traveling in 10^16 m/year to travel across the diamerter of the Milky Way?

I am really confused on this one, and need some help.

Thanks . How many pints of a 9% cleaning solution must be mixed with 10 pints of a 13%
cleaning solution to give a 11% solution?