book Maths Puzzle Numerical Ability

simplify this expression. Assume all variables are positive. (thank you !!)

{y^(1/6)}^3

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book Other Question

(x^2+x-20) (x^2+10+25)
_________ divide __________
(x^2-7x+12) ( x^2-6x+9)
Can someone out there help me with this problem?

At what rate would a 180-poind person burn calories while bicycling at 12 mi/h? (For a 150 pound person bicycling they burn 410 calories/h.
Thanks,
Sher