1 3/4 times Ben's money is equal to 1 2/5 times Jack's money. 1 2/3 times Andy's money is equal to 1 1/9 times Ben's money. If Andy has $x, what is the amount of difference between Andy's and Jack's money in terms of x?
1 3/4 b = 1 2/5 j
1 2/3 x = 1 1/9 b
solving that, we get
b = 1 1/2 x
j = 1 7/8 x
so j - x = 7/8 x