Question 1201079
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Tutor @mananth has provided a good standard formal algebraic solution.  You can use that as a good example of how the problem can be solved.<br>
Or, if you like to torture yourself, you can also use the rather absurd method tutor @josgarthmetic loves to show on this kind of problem -- with all those variables.<br>
Finally, if a formal algebraic solution is not required, this problem can be solved in a few seconds informally:<br>
The target of 60% is 3/4 of the way from 30% to 70%; therefore, 3/4 of the mixture is the 70% fruit juice.<br>
ANSWER: 3/4 of 80 pints, or 60 pints, is the 70% fruit juice; the other 20 pints is the 30% fruit juice.<br>