exam Maths Puzzle Numerical Ability

Please note that the question is not to simplify 18 - 7 - 6 -4 but to get the condition under which the sum of a positive number and several negative numbers will be positive.

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The perimeter of a rectangular garden is 298 feet. If the width of the garden is 66 feet, what is its length? Give an example of a rational expression P/Q such that: The degree of the denominator Q is 3 and this expression is defined for all real numbers except the values 2 and 4.