16. Ulysses, Kim, Mei and Tanika have their 12th, 14th, 15th and 15th birthdays today. In what year will their ages first total 100 ?
A 2023
B 2024
C 2025
D 2057
E 2113
Solution: B
Today the total of their ages is $12+14+15+15=56$. Each year they are all grow 1 year older, and so the total of their ages increases by 4 . This needs to increase by $100-56=44$ years in order to reach 100 years. This will take $\frac{44}{4}=11$ years. In 11 years time it will be $2013+11=2024$.