book Maths Puzzle Numerical Ability

simplify the following algebraic expression


(25x^3)^2/3 / (125xy^2)^1/3

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book Other Question

Take 9 from 6, 10 from 9, 50 from 40 and leave 6.

How Come ??
i have this problem but it's not in the book...

Find what the minimum surface area for a cylindrical can will be to hold {{{500cm^3}}}. Give the radius and height.