David is 12 years older than his daughter Rosy. In 4 years David will be twice as old as Rosy. What is Rosy current age.
Options.
A) 9  B) 10  C) 11  D) 8  E) 12

Rationale: "now : rosy = x , david = x + 12 in 4 years rosy = x + 4 , david = x + 12 + 4 or 2 ( x + 4 ) x + 16 = 2 x + 8 x = 8 rosy is 8 years old answer : d"
Answer: D