exam Maths Puzzle Numerical Ability

A rectangular park is three blocks longer than it is wide. The area of the park is 40 square blocks. If w represents the width, write an equation in terms of w for the area of the park

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(3x - 1)^2 what is the minimum score needed to make on the 5th test so that the mean test score is at least 85? The first 4 test were 87, 92, 76, and 89