Let the proper fraction is x/y.
Then (x - 20% of x)/(y + 10% of y)= 16/55.
⇒ (80 X x)/(110 X y) = 16/55.
⇒ x/y = 16/55 X 110/80 = 2/5.
Then (x - 20% of x)/(y + 10% of y)= 16/55.
⇒ (80 X x)/(110 X y) = 16/55.
⇒ x/y = 16/55 X 110/80 = 2/5.

