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Question 699530:
Answer by khv_maths(12) About Me  (Show Source):
You can put this solution on YOUR website!
That's mean you are 4 years old and your sister is 4%2F2 years old. = 2 y.o
So, when you was 2, your sister should be 2%2F2 years old. = 1 y.o
Back to question, you are 100 years old, so, your sister should be 100%2F2 years old.
So, the answer is 50