Let us set up an equality to represent the original ratio of walnuts to fruit..
Solve for X (2/3)/(3/5) = X/1
(2/3)/(3/5) = X/1 (2/3) * (5/3) = X/1 10/9 = X/1 10/9 = X
Therefore, Abigail needs 10/9 pounds of walnuts to mix with one pound of dried fruit.