Question 1147449
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We will overlook the scientific fact that you can't have an 80% salt solution (assuming you mean regular NaCl); we will simply treat this as a typical mixture problem.<br>
Here is the fastest way to the answer to a mixture problem like this, without using any variation of the standard algebraic approach outlined by the other tutor.<br>
(1) The 80% target is 9/10 of the way from 35% to 85%.  (Picture the three percentages on a number line; 35 to 80 is a difference of 45; 35 to 85 is a difference of 50; 45/50 = 9/10.)
(2) Therefore, 9/10 of the mixture needs to be the higher percentage ingredient.<br>
ANSWER: 9/10 of 130 ounces, or 117 ounces, of the 85% solution; the other 13 ounces is the 35% solution.