Question 83360
Well Just try a simple chart, just see a number and itself x2 so you're left with the number of nickels.  It has to add up to 20

N  D  Q  Price:
17 1  2  1.45
14 2  4  1.90
11 3  6  2.35
8  4  8  2.80
5  5  10 3.20
2  6  12 3.70

It looks like there are 2 nickels!