book Maths Puzzle Numerical Ability

Solve for x

2x-9/x-5 = 1/x-5

/ indicates fraction

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book Other Question

20 men can do a piece of work in 24 days. After working for few days,4 men are added and the work was finished 3 daysearlier.After how many days were 4 men added? I need the formula for computing the area of a circle