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. 

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