Three waiters at a local restaurant earned different amounts of money the past week. Jennifer earned $40 less than twice the amount Tony earned. Chris earned $60 more than Tony. How much did each waiter earn if the total of all three was $900?

Let x be the amount earned by Tony. With this representation, Jennifer earned 2x - 40 and Chris earned x + 60. The amounts they earned should sum up to 900. The equation is,

x + (2x - 40) + (x + 60) = 900

The value of x is 220. Therefore, Tony earned $220. Jennifer and Chris earned $400 and $280, respectively.