Present ages of David and Balu are in the ratio of 5 : 4 respectively. Three years hence, the ratio of their ages will become 11 : 9 respectively. What is Balu’s present age in years ?

\par Let the present ages of David and Balu be 5x years and 4x years respectively.

\frac{5x+3}{4x+3} = \frac{11}{9}

9(5x+3) = 11(4x+3)

x = 6

\par Balu's present age = 4x = 24 years