Q: Emily is 20 years old and her older sister, Rachel, is 24 years old.  How old is Rachel when Emily is half her age?
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A: The difference in age between the two sisters is 24 - 20 = <<24-20=4>>4 years.
When Rachel is twice Emily’s age, she is 4 x 2 = <<2*4=8>>8 years old. The answer is  8.
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