Question 1134842
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There is an alternative to the standard algebraic method for solving mixture problems like this, as shown in the solution from tutor @ikleyn.<br>
The alternative method is based on where the mixture percentage lies between the percentages of the two ingredients.<br>
The given numbers in this problem make the solution almost trivial.  Here is what the method looks like for this problem.<br>
(1) The 32% target percentage is 22/90 of the way from the 10% of the first ingredient to the 100% of the second ingredient. (100-10 = 90; 32-10 = 22; so 22/90)
(2) That means 22/90 of the mixture has to be the second ingredient.
(3) 22/90 of 90L is 22L<br>
So 22L of the 100% pure acid, 90-22 = 68L of the original 10% acid.