Question 1200988
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This should be easy enough to solve in your head.







From "When Vanessa was 4 years old, her sister was half her age. "   you get
that her sister was 4/2 = 2 years old.

The difference between their ages (which is 4 - 2 = 2) stays constant for their entire lives, so when Vanessa is 100, her sister is 100 - 2 = 98.

Hope this makes sense.