exam Maths Puzzle Numerical Ability

The length of a rectangular playing field is 5 ft less than twice its width. If the perimeter of the playing field is 230 ft, find the length and width of the field.

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exam Other Question
The net weight of a bottle of olives is 216grams. Find the smallest number of bottles that must be purchased tohave at least 2kilograms of olives.


Thanks!!! how do I figure out 2x^-3*y^-2/z^4