a piggy bank contains only quarters and nickels, and there is a total of 60 coins. the total value of coins in the bank is 7.40. How many quarters are in the piggy bank?
a piggy bank contains only quarters and nickels, and there is a total of 60 coins. the total value of coins in the bank is 7.40. How many quarters are in the piggy bank?
Let the number of nickels=N
The number of quarters =60 - N
.05N + .25[60 - N] =7.40
.05N + 15 - .25N =7.40
-.20N =7.4 - 15
-.20N=-7.6 divide both sides by -.20
N =38 number of nickels
60 - 38 =22 number of quarters.
