SOLUTION: a parking meter contains nickels and quarter worth $11.40. There are 84 coins in total. Find how many of each there are

Algebra ->  Customizable Word Problem Solvers  -> Coins -> SOLUTION: a parking meter contains nickels and quarter worth $11.40. There are 84 coins in total. Find how many of each there are      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 958800: a parking meter contains nickels and quarter worth $11.40. There are 84 coins in total. Find how many of each there are
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
N+Q=84 OR N=84-Q
.05N+.25Q=11.40 SUBSTITUTE (84-Q) FOR N IN THIS EQUATION.
.05(84-Q)+.25Q=11.40
4.20-.05Q+.25Q=11.40
.20Q=11.40-4.20
.20D=7.20
D=7.20/.20
D=36 QUARTERS.
N+36=84
N=84-56
N=48 NICKELS.
PROOF.
.05*48+.25*36=11.40
2.40+9.00=11.40