Question 432037
If you're making a 400 gram mixture of cranberries and raisins, then C+R=400. Let's take one gram of raisins---It's made up of .308 grams of potassium.  Then:

R+C=400gm
.308R+.044C=.220(400gm)=88gm

Multiply the second equation by 1000
308R+44C=88000
44R+44C=400X44=17600
(308-44)R=88000-17600=70400
264R=70400
R=266 2/3 gms.
C=133 1/3 gms.