book Maths Puzzle Numerical Ability

I am trying to solve a problem relating the volume to the surface area of a sphere. I got this far and cannot finish it. Can you please help me? Thank you.

v=4/3pi*(s/4pi)**3/2

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book Other Question

Hey! Could you please help me with this problem? I think it's dealing with vertex and quadratic functions. It would help if you could explain the answer step by step. Thanks so muc Yuki, Mollie, Brandon and Anna share an apple pie for desert. Bradon eats half the amount Mollie eats. Yuki eats four times as much pie as Brandon. Mollie eats 1/4 of the pie. How much does Anna eat?