Question 105258
Let x=required amount of yogurt that is 3% fat 
Then 60-x=required amount of no-fat yogurt 

Now we know that the amount of pure fat in the 3% yogurt (0.03x) plus the amount of pure fat in the no-fat yogurt (0) has to equal the amount of pure fat in the final 1% yogurt mixture(0.01*60) so or equation to solve is:

0.03x=0.01*60 simplify

0.03x=0.6  divide both sides by 0.03
x=20 lbs-----------------------------amount of yogurt that is 3% fat

60-x=60-20=40 lb-------------------------amount of no-fat yogurt needed

CK

0.03*20=0.01*60
0.6=0.6


Hope this helps---ptaylor