Question

A waiter earned $31 in tips in an hour. He was paid in $1 bills and $5 bills. Use a model to determine how many $5 bills he received if he received a total of 15 bills.

1

2

3

4

Answer 1

15/5= ?

Answer 2

Let x= number of 1s. Let y= number of 5s
x + y = 15 and 1x + 5y = 31
Solve these simultaneos equations. x + y = 15 gives us x = 15 - y
Substitute in the other: (15 - y) + 5y = 31
4y = 16
y = 4
4 five dollar bills

Answer 3

15/5=3

Answer 4

Bangkok response sounds more legit. >_>
Let me think.

Answer 5

Bangkok has the right answer.

Answer 6

@Elysium