Question 699530
That's mean you are 4 years old and your sister is {{{4/2}}} years old. = 2 y.o
So, when you was 2, your sister should be {{{2/2}}} years old. = 1 y.o
Back to question, you are 100 years old, so, your sister should be {{{100/2}}} years old.
So, the answer is {{{50}}}