exam Maths Puzzle Numerical Ability

solve application problem: A company manufactures both lcd and crt monitors. The costs of materials for a crt monitor is $50, whereas the cost of materials for an lcd monitor is $

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Write the equation of the line passing through (-3, -5) and (3, 0) One video rental club charges $25 to become a member and $2.50 to rent each video. Another charges no membership fee, but charges $3.25 to rent each video. How many videos must you rent to make the first club more economical?