Diane is twice as old as her brother, Will. If Will was 4 years old 3 years ago, what will the sum of their ages be in 5 years? Give me reasons, before answering the question
Since Will was 4 years old 3 years ago, then he is 4 + 3 = 7 years old now. Dina is twice as old as he is so she is 2 * 7 = 14 years old now. In 5 years, Will will be 7 + 5 = 12 years old. In 5 years, Diane will be 14 + 5 = 19 years old. The sum of their ages at that time will be 12 + 19 = 31 years. So the final answer is 31.