book Maths Puzzle Numerical Ability

what is 140 as a percentage????

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book Other Question

Please help me with this.

Find the perimeter of the triangle if the three sides are:
4, sqrt 5 - sqrt 5, sqrt 5 + sqrt 5

Thanks
I can't figure this problem out. I need help!! PLEASE!

(18x^-2y^4) ^-4
___________
(12x^-6y^7)

basically in words it says 18x to the negative 2 y to the 4th over 12 x to th