Question 205466
Let x=amount of regular (3%) yogurt that is needed
Then 60-x=amount of no fat yogurt that is needed

Now we know that the amount of pure fat that exists before the mixture (0.03*x) has to equal the amount of pure fat that exists in the final mixture (0.01*60), so our equation to solve is:
0.03x=0.01*60 simplify
0.03x=0.6  divide each side by 0.03
x=20 lbs-------------------------amount of 3% yogurt needed
60-x=60-20=40 lb-----------amount of no fat yogurt needed
CK
0.03*20+0.0*40=0.1*60
0.6=0.6

Hope this helps---ptaylor