Fun with fractions

If 1 is added to the numerator and denominator of a fraction, the fraction becomes 3/4. If 3 is added to the numerator and to the denominator the fraction becomes 4/5. Find the fraction.

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How about 5/7

5/7 —> 6/8 = 3/4 {added 1 to numerator and denominator}

5/7 —-> 8/10 = 4/5 {added 3 to numerator and denominator}

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