book Maths Puzzle Numerical Ability

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two planes leave chicago, one traveling due east one traveling due west, the first travels 100mph faster then the second how long will it be when they are 2000 miles a

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What is the correct way to find the sum of 1+4+7+10+13......100 The lengh of a rectangle is represented by (x-6) and the width of the rectangle is represented by (x+2). Express the area of this rectangle as a binomial in terms of x.