book Maths Puzzle Numerical Ability

Can someone show me how to simplify this

(x^1/3 divided by x^5)^3

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book Other Question

Translate the English sentence into an equation using the variables indicated: The ratio of brick houses to wooden houses in a particular city is 5 to 11. Let b = the number of brick houses and w = the number of wooden houses. Suppost is proportional to xsq If y=20 when x=2 find Y when x=3