exam Maths Puzzle Numerical Ability

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.

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exam Other Question

graph the equation 4x+y>_4 (4x+y is greater than or equal to 4) Ricky can install a basic security system in 4 hours. If it takes Ricky and Mark 2 hours working together to install this system, how long does it take Mark working alone?