Question

A waiter earned $16 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 12 bills.

1

2

3

4

Answer 1

4

Answer 2

$16=$1n+$5m
12=n+m
rearrange for n
n=12-m
sub back value into:$16=$1n+$5m
$16=$1(12-m)+$5m
$16=$12-$m+$5m
4m=4
m=1 therefore 1 five dollar bill and 11 1 dollar bills