Algebra
posted by Rose .
Cedric cashed a $125 check at the bank. The teller gave Cedric his money in $5 and $10 bills only. If the teller gave Cedric twice as many $10 bills as $5 bills, how many of each type did cedric receive?
Lefkios went to a fast food restaurant for breakfast. He ate an egg sandwich and 2 hash browns for a total of 550 calories. If an egg sandwich has 3 times as many calories as one hash brown, how many calories are in each?

1. Let x = # of $5, then 2x = # of $10
5x + 2(10x) = 125
Solve for x, then 2x
2. Let x = hash brown calories, then egg = 3x
2x + 3x = 550