SOLUTION: Kathy paid $320 in cash for a CD player. If she paid in $20 and $10 notes and there were 23 notes all together, how many of each type were there?

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Kathy paid $320 in cash for a CD player. If she paid in $20 and $10 notes and there were 23 notes all together, how many of each type were there?      Log On


   

Question 723997: Kathy paid $320 in cash for a CD player. If she paid in $20 and $10 notes and there were 23 notes all together, how many of each type were there?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Kathy paid $320 in cash for a CD player. If she paid in $20 and $10 notes and there were 23 notes all together, how many of each type were there?
----
# of notes Equation: x + y = 23
Value Equation:::::20x+10y = 320
---------------------------------
Modify for elimination:
x + y = 23
2x+ y = 32
----
Subtract and solve for "x":
x = 9 (# of $20 notes)
Solve for "y":
x + y = 23
9 + y = 23
y = 14 (# of $10 notes)
===========================
Cheers,
Stan H.
===========================