Question 1056373
One canned juice drink is 25% orange juice; another 
is 5% orange juice. How many liters of each should 
be mixed together in order to get 20L that is 24% 
orange juice?
<pre><font size=4><b>
                        % as     pure 
                Liters|decimal| juice  |
----------------------------------------             
Stronger juice |   x  | 0.25  | 0.25x  |     
Weaker juice   |   y  | 0.05  | 0.05y  |
----------------------------------------
Medium juice   |  20  | 0.24  |0.24(20)|

{{{system(

matrix(2,5, x,""+"",y,""="",20,
           0.25x,""+"",0.05y,""="",0.24(20)))}}}

You should be able to solve that system by 
substitution.  If you have trouble tell me
in the email form below and I'll get back to
you by email.  No charge ever. I do this for
fun.

Edwin</pre></b></font>