Question 969815
If I have 22 dimes and quarters worth $4.30. How many dimes do I have?
==============
D + Q = 22  (# of coins)
10D + 25Q = 430  (value)
------------
Or,
22 dimes = $2.20
Each dime replaced by a quarter adds 15 cents.
430 - 220 = 210 added by replacement
210/15 = 14 quarters
--> 8 dimes