A: In 8 years, Richard will be twice as old as Scott, so in 8 years, Scott will be 8 * 2 = 16 years old. Since David is 6 years older than Scott, then David is 16 - 6 = 10 years older than Scott. In 5 years, David will be 10 + 5 = 15 years old. So, 5 years ago, David was 15 - 5 = 10 years old. The answer is (A).
Answer the following multiple choice question with options (a), (b), (c), (d), (e) by reasoning step-by-step.
Q:A certain family has 3 sons: Richard is 6 years older than David, and David is 8 years older than Scott. If in 8 years, Richard will be twice as old as Scott, then how old was David 5 years ago? Answer Choices: A) 9 B) 10 C) 12 D) 14 E) 16