book Maths Puzzle Numerical Ability

a local park is 30 meters long by 20 meters wide. Plans are being made to double the area by adding a strip at one end and another of the same width on one side. find the width of the strips

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book Other Question

Which of the following expressions represents the product of 3 less that twice x and 2 more then the quantity 3times x ? Factor each polynomial completely, given that the binomial following it is a factor of the polynomial.

1. x^3-4x^2-3x-10,x-5
2. w^3+5w^2-w=5
3. t^2+1=13/6t