SOLUTION: Nancy is double her sisters age.They are both older than 20 and younger than 50 . They are both multiples of 7 . How old are they?

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Question 1101720: Nancy is double her sisters age.They are both older than 20 and younger than 50 . They are both multiples of 7 . How old are they?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
Nancy is 2x
Sister is x
Their sum has to be between 40 and 100, twice 20-50
40<3x<100
13.3 x is divisible evenly by 7, so the possibilities are 14, 21 and 28
21 is the only one that has 2x < 50
Nancy is 42, her sister is 21.