Question 32639: Darrell has 2$ less than five times as much money as Bob. Mary has as much money as Darrell and Bob put together. If all three of them together have 80$, how many money does Mary have? Answer by stanbon(60778) (Show Source):
You can put this solution on YOUR website! Let D,B, and M stand for the amount of money each has.
Solve using Cramer or row reduction.
I get Bob has $7, Darrell has $33, and Mary has $40