Question 1101792
Let A denote the 42% solution and B denote the 39% solution which we have.
Let C denote the 41% solution which we want.
Using the method of alligation.
<pre>
42         2 2/3*24=16 L of 42% solution
      41            16+8=24 L of 41% solution
39         1 1/3*24=8 L of 39% solution
           3
</pre>
1= 42 - 41
2= 41 - 39
E.g. There are 2 parts of A plus 1 parts of B
Then 2+1=3 parts total
2/3=0.66666667
0.66666667*24=16
16 L of 42% solution.
24 L-16 L=8 L
8 L of 39% solution.
or
1/3=0.33333333
0.33333333*24=8 L
8 L of 39% solution.
check
0.39 * 8 + 0.42 * 16 = 0.41*24
3.12 + 6.72 = 9.84
9.84 = 9.84
ok