exam Maths Puzzle Numerical Ability

1) A rectangle is 2 times as long as it is wide. If the area is 242 square feet, find its perimeter.

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A publisher prices a book at $20. 20000 copies can be sold for every dollar by which the price is increased. Saleswill fall by 500books. What should the book cost in order to gen what is the defeniton of slope intercept form of an equation?