Correct
Explanation
Diana is 16, so her brother is 4. She is 12 years older, so she needs to be 24 to be two times older than her 12-year-old brother.
Solve this puzzle
If 9999 = 4, 8888 = 8, 1816 = 3, 1212 = 0, then 1919 =
2 8 1 3