book Maths Puzzle Numerical Ability

one side of a pool table is 1 foot longer than twice the width. the area of the pool table is 15 square feet. what is the length of the table?
how would you write this as a formula?

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book Other Question

One number is 8 less than another. If 5 times the smaller number minus 2 times the larger number is 14, find the two numbers. Use parabolas to work the following problem: find two numbers having a sum of 50 such that the sum of the square of one and three times the square of the other is a minimum.