exam Maths Puzzle Numerical Ability

graph the equation 4x+y>_4 (4x+y is greater than or equal to 4)

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exam Other Question

Colored copies cost $.10 per copy and white copies cost $.5 per copy. Sandy made 400 copies, some of which were colored and the rest white. Her total bill was $22.50. How many colored copies and how many white copies did she make? Two points P and Q lie on opposite sides of a line L. Find on L the point A for which the difference AP-AQ is the largest. Show the proof.