Question 560732: Stefan has a collection of nickels, dimes, and quarters. In all, he has 24 coins. seven of the coins are quarters. The total value of he collection is $2.90. How many nickels ad how many dimes does he have
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Stefan has a collection of nickels, dimes, and quarters. In all, he has 24 coins. seven of the coins are quarters. The total value of he collection is $2.90. How many nickels ad how many dimes does he have
-----
Equations:
n + d + q = 24 coins
5n+10d+25q = 290 cents
q = 7
-----
n + d = 17
5n+10d = 115
---------------------
5n + 5d = 85
5n +10d = 115
----------------------
5d = 30
d = 6 (# of dimes)
------
Solve for "n":
n + d = 16
n + 6 = 16
n = 10 (# of nickels)
=========================
Cheers,
Stan H.
================
|
|
|
