If the numerator of a fraction be increased by 20% and its denominator be diminished by 10%, the value of the fraction is 20/21. Find the original fraction ?  Choose one.
A) 1/2  B) 3/5  C) 4/7  D) 5/7  E) 7/9
Let the original fraction be x/y   Then, 120% of x/90% of y = 20/21   120x/90y = 20/21   x/y = 5/7   Answer is 5/7
<result>D</result>
If the numerator of a fraction be increased by 20% and its denominator be diminished by 10%, the value of the fraction is 20/21. Find the original fraction ?