Using five dollar bills, ten dollar bills and twenty dollar bills a bank teller cashes a check for $185 .In all, fourteen bills were handed to the customer. The number of twenty dollar bills were twice the number of five dollar bills. Find the number of ten dollar bills given to the customer.
2007-02-17 13:29:22 · 3 answers · asked by freckles1063 3 in Education & Reference ➔ Homework Help
you can write 3 equations from the info given
let x be the # of $5 bills, y be the $10, and z be the $20
5x + 10y + 20z = 185
x+y+z=14
z=2x
substitute z=2x into the first 2 equations
5x + 10y +20(2x)=185
x+y+2x = 14
rewrite the 2nd equation as y=14-3x
and substitute it into the first equation
5x + 10(14-3x) +40x = 185
5x + 140 -30x + 40x = 185
15x = 45
x=3
plug in x to find y and z
z=2x = 2(3) = 6
3+y+6=14
y=5
so there were 3 $5 bills, 5 $10 bills, and 6 $20 bills
2007-02-17 13:57:12 · answer #1 · answered by ... 3 · 0⤊ 0⤋
there are 6 twenties, 3 fives & 5 tens
2007-02-17 21:35:08 · answer #2 · answered by schinsy 2 · 0⤊ 0⤋
has to be 3 $5's, 6 $20's and 5 $10's
have a nice day!
2007-02-17 21:35:50 · answer #3 · answered by sharrron 5 · 0⤊ 0⤋