Solution
For this case we can create the following system of equations:
x + y= 6
1.7 x + 3.20 y= 13.2
Solving for x we got:
x= 6-y
And replacing we got:
1.7 (6-y) +3.20 y = 13.2
10.2 - 1.7y + 3.20y = 13.2
1.5y=3
y= 2
And solving for x we got:
x= 6-2= 4
Then the answer would be:
4 lbs of the cheaper chocolate
2lbs of the expensive chocolate
