Find the original fraction if in a fraction, numerator in increased by 25% and the denominator is decreased by 10%. The new fraction then obtained is 5/9.
Correct Answer: Option A
Let the original fraction be x/y
Now numerator increase by 25% i.e. \(x + \frac{{25}}{{100}}x\)
Denominator diminished by 10%i.e. \(y - \;\frac{{10}}{{100}}y\)
∴ New fraction becomes \(\frac{{x + \frac{{25}}{{100}}x}}{{y - \frac{{10}}{{100}}y}} = \frac{5}{9}\)
\(\Rightarrow \frac{{x + \frac{1}{4}x}}{{y - \frac{1}{{10}}y}} = \frac{5}{9} \Rightarrow \frac{{\frac{5}{4}x}}{{\frac{9}{{10}}y}} = \frac{5}{9}\)
\(\Rightarrow \frac{{10x}}{{4y}} = 1.\)
\(\Rightarrow \frac{x}{y} = \frac{4}{{10}} = \frac{2}{5}\)
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