Question 1101720
Nancy is 2x
Sister is x
Their sum has to be between 40 and 100, twice 20-50
40<3x<100
13.3<x<33.3
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.