Problema Solution
Debra saved only dimes and nickels in her bank. When she last counted the coins, she noticed there were
twice as many dimes as nickels. She had $4.75 in her bank. How many dimes did she have in her bank?
Answer provided by our tutors
1 nickle = 5 cents
1 dime = 10 cents
Let
n = the number of nickles, n>=0
d = the number of dimes, d>=0
Debra had twice as many dimes as nickels.
d = 2n
She had total of $4.75 = 475 cents:
5n + 10d = 475
We have the following system of equations:
d = 2n
5n + 10d = 475
........
click here to see the system of equations solved for d and n
........
d = 38 dimes
Debra had 38 dimes in the bank.