book Maths Puzzle Numerical Ability

I would like to know how to figure these two problems out step by step using equations that contain like terms. Here are the questions:
1. Peter used a $5.00 gift certificate to h

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(-P->-L) & (-L->L) |- P

I have no clue what I am doing....i know i have to provisionally assume something but i have no clue where to get started. I understand what i'm doing i How would you solve this equation?

The width of a rectangle is 6 cm less than the length. The perimeter is 72 cm. Write and solve an equation to find the width and the length of the rectangle.