After saving 4/5 of his salary every month, Zacky has $150 left. Micah saves 6/7 of his salary every month. If both guys save an equal amount each month, how much is their combine salary?
Let x = Zacky's salary.
1/5x = 150
x = 750
4/5 of 750 = 600
Let y = Micah's salary
6/7y = 600
Solve for y, and then add x + y.