self Maths Puzzle

in a fraction,if numerator is increased by 1,it becomes 1/2.if a numerator is increased by 9,then fraction becomes 1.find the denominator.

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self Other Question

After offering a discount of 20% on the list price a trader gains 25%. If the discount is increased to 25% approximately what is the gain percentage.

Options...
10.5%
15%
20%
17.2%
The expenditure and savings are in the ratio 4:1.if his savings is increased by 25% then what is the new ratio of his expenditure and savings?