Question 10956
Let there be X 5cent coins and Y 25cent coins
Now we know X+Y = 25

and 5X +25Y = 225
Dividing by 5 throughout

X+5Y=45
X+Y=25
Subtracting we get
4Y=20
Y=5
which means X=20

Check:
20x5 + 25x5
100+225 = 225 = $2.25  Yay!!!