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.

(A) 1

(B) 2

(C) 3

(D) 4

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. 

(A) 1 

(B) 2 

(C) 3 

(D) 4

anonymous · Answer

its c

mathmale · Answer

Hi, Abby!  Recognize that this is a problem involving simultaneous equations?
Why don't we let the number of $1 bills be x and the number of $5 bills be y?
How many bills are there altogether?  Then x+y=?
How much are the bills worth all together?  $1x + $5y= ?

Create those two equations and solve them simultenously.  Use substitution, addition/subtraction, graphing or whatever method you favor.
suppose the answer were c.  Then you'd have 3-$5 bills and 9-$1 bills.  Does that add up to $16?

anonymous · Answer

yes it would @mathmale

mathmale · Answer

So, Abby, you're saying that 9x$1 + 3x$5 = $16?

mathmale · Answer

Please try the same thing with Option 1.
Which would be the better choice for your final answer?