Question 1105018
We have 20 qts of 20% solution.
Using the method of alligation.
20= 40 - 20
10= 50 - 40
40.0= 20/(10/20) qts of 50% solution to add to your 20 qts of 20% solution.
60.0= (20+40.0) qts of the final 40% solution.
check
0.5 * 40.0 + 0.2 * 20 = 0.4*(20+40.0)
20.0 + 4.0 = 0.4*(60.0)
24.0 = 24.0
ok
<pre>
20         10        20 qts of 20% solution
      40            60 qts of 40% solution
50         20 20/10*20=40 qts of 50% solution
           30
</pre>