exam Maths Puzzle Numerical Ability

In a family there are two cars. In a given week, the first car gets an average of 20 miles per gallon, and the second car gets 40 miles per gallon. The two cars combined drive a to

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Help please: Determine algebraically whether the lines are parallel, perpendicular or neither. State the number of solution.

x - y = 5
x = 5 - y The length of a rectangular sign is 3feet longer than the width. If the sign has a area of 40 square feet for advertising , find its length and its width.