Question 279801
Alicia opens her piggy bank to find only nickles and dimes inside. 
She counts the coins and finds that there are 38 coins totaling $3.20. 
How many nickles were in the piggy bank, and how many dimes where in the piggy bank?
----------------
Equations:
Quantity: n + q = 38
Value::: 5n +25q = 320 cents
----------------------------------
multiply thru the Quantity equation by 4 to get:
5n + 5q = 190
-----
Subtract that from the Value Equation and solve for "q":
20q = 130
q = 6.5
==================
Note: That value of q should be a whole number.
Check the data in your problem.
==================================
Cheers,
Stan H.