Problema Solution
Joey decides to empty his piggy bank and count his money. His bank is filled with only nickels and dimes. Joey counted a total of 45 coins that added up to $3.15. How many nickels and how many dimes does Joey have in his piggy bank?
Answer provided by our tutors
1 nickle = 5 cents
1 dime = 10 cents
$1 = 100 cents
$3.15 = 135 cents
Let
n represent the number of nickles, n>=0
d represent the number of dimes, d>=0
Joey counted a total of 45 coins that added up to $3.15:
n + d = 45
5n + 10d = 315
........
click here to see the system of equations solved for n and d
........
n = 18 nickles
d = 27 dimes
Joel has 18 nickles and 27 dimes in his piggy bank.