exam Maths Puzzle Numerical Ability

the length of a rectangular field is 75yd.This is 3yd more than twice the width.how wide is the field??

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The points with coordinates (ab) (a',b') (a"b") are points of a parabola y=3x^2.
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What multiplier should be used for each of the following equations to eliminate one unknown by subtraction?

3x-y = 7 2x+7y = 42