1) In 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older than B, the present age of B is : A) 19 years B) 29 years C) 39 years D) 49 years Answer: Option CExplanation:Let B's present age = x years .Then ,A's present age =(x+9) years (x+9)+10=2(x-10)x+19=2x-20 x=39
