Question 364017: A wallet contains $2.20 in coins (nickels and dimes). If there are 32 coins in total, how many of them are nickels?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A wallet contains $2.20 in coins (nickels and dimes). If there are 32 coins in total, how many of them are nickels?
------
Quantity Eq.::: n + d = 32 coins
Value Eq:::::: 5n+10d = 220 cents
------------------------------------
Multiply thru Quantity Eq. by 5 to get:
5n+5d = 5*32
-----
Subtract that from the Value Eq and solve for "d":
5d = 220-5*32
5d = 60
d = 12 (# of dimes)
---
Since n+d = 32, n = 20 (# of nickels)
===================
Cheers,
Stan H.
|
|
|
