1. Cicely had her $21^{\text {st }}$ birthday in 1939 .
When did she have her $100^{\text {th }}$ birthday?
A 2020
B 2019
C 2018
D 2010
E 2008
Solution
C

Cicely had her 21st birthday in 1939. Since $1939-21=1918$, it follows that she was born in 1918.

Now, $1918+100=2018$.
Therefore Cicely's 100th birthday was in 2018 .