Question 952575
Assign a variable to the amount of one of the candies, your choice which.  Either candy may be u and then the amount of the other candy would be 120-u.


You can do your calculation in cents per pound if you want.  Try to account for the cost of the mixture.


Let u = pounds of the cheaper, 45 cents per pound, candy:


{{{45u+70(120-u)=55*120}}}