book Maths Puzzle Numerical Ability

how could i find "x" in this problem? 9/(x-3) - (x-4)/(x-3) = 1/4

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book Other Question

name the quadrant in which the point (4, -70) lies Mary is 20 years old. Her sister, Sara, is 5 years old. In how many years will Mary be twice as old as Sara?