exam Maths Puzzle Numerical Ability

Simplify the expression:

2[12-3(4+2)]

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exam Other Question

(x)/(x^2+9x+20) - (4)/(x^2+7x+12) I am having trouble with this problem.

Thanks for any help
Rhee

The width of a rectangle is 15 feet less than its length, and the perimeter is 210 feet. Find the width: