book Maths Puzzle Numerical Ability

the width of a rectangle is 5 inches less than its length, and the area is 150 square inches. what is the width of the rectangle?

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book Other Question

I am a two digit number. My ones and tens digits are the same. The sum of my digits is 8. What number am I? How do you solve the problem x^2=1/9? I tried recriprocals but I am still confused...