book Maths Puzzle Numerical Ability

I'm not sure how to get 3 over 5-the square root of 2
Could you help me? thanks!

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book Other Question

A cylinder has a radius of 5 in. If the volme of the cylinder is 250π in.3, what is the height of the cylinder? [Hint: The volume of a cylinder is given by V = πr2h.]

find z if 3z-19=173-wang