Question 149742
Call the pounds of regular yogurt you need {{{r}}}
Call the pounds of no-fat yogurt you need {{{n}}}
You have to end up with a mixture that is 1% fat.
Stated in words this is:
(pounds of fat you end up with) / (total pounds of mixture) = % fat
What is the pounds of fat you end up with?
There's no fat from the no-fat yogurt
The pounds of fat from the regular yogurt is {{{.03r}}}
The problem says you need to end up with {{{60}}} pounds of yogurt
{{{.03r / 60 = .01}}}
{{{.03r = .6}}}
{{{r = 20}}}
That leaves {{{60 - 20 = 40}}} pounds of the no-fat that need 
to be added
20 pounds of the regular and 40 pounds of the no-fat are needed
check answer:
{{{.03*20 / 60 = .01}}}
{{{.6/60 = .01}}}
{{{.6 = .6}}}
OK