book Maths Puzzle Numerical Ability

The length of a rectangle is three inches more than the width. The area of the rectangle is 270 inches. Find the width of the rectangle.

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book Other Question

I am having problems setting up this problem. The sum of the digits in a two digit number is 8. When the digits are reversed, the new number is 8 less than the original number. What is the original number? what is radical 5/3 plus radical 3/5