http://www.aqa.org.uk/qual/gcse/math_b_assess.html

I would give this one specifically:

The length of a computer keyboard is 11 inches longer than it is wide. The total area of the keyboard is 80 inches squared. Find the length and the width of the keyboard.

A = LW

80 = (x + 11)(x)

80 = x^2 + 11x

x^2 + 11x – 80 = 0

(x-5)(x + 16) =0

x-5 = 0 or x + 16 = 0

x = 5 or x = -16

x must equal five as negative dimensions do not exist

x = 5 = width

x+11 = 5 + 11 = 16 = length

If you are looking for short cuts to intelligent questions than I would suggest you look up the study material for these topics in some coaching books for B-school admission tests ( CAT, etc). They have some good questions and most are high school standard with a twist.