How many pounds of gourmet candy selling for $2.20 per pound should be mixed with 6 pounds of gourmet candy selling for $1.20 per pound to obtain a mixture selling for $1.60 per pound?
There are two ways of solving this.
Standard form equation
In this case:
The approach is based on the principle that the gradient is constant.
Basically this is saying that the gradient of the whole is the same gradient as part of it!
Let the whole weight be