book Maths Puzzle Numerical Ability

How do I work out what percentage one figure is of another. i.e. If I have an overall figure (B) of 134,789 and part of this is A which equals 27,987 what percentge is A of B?

Many thanks

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book Other Question

Perform the indicated operations. Simplify the result.

(5x^2y/2xy) * (6x^3y^5/10y) * (3x/y^3) I have no idea if i solve this in a (a + b)(a - b)=a^2 - b^2 way.

But the problem is to simplify in simplest form:

(The squrt of 3 minus the squrt of 5)*(The squrt of 3 minus squrt of 5)