book Maths Puzzle Numerical Ability

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.

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book Other Question

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 A salesman packed 3 shirts and 6 ties. With one shirt, he could wear all six ties. With another shirt, he could wear 5 ties. With the 3rd shirt, he could only wear 2 ties. How many different combinations did he have?