Question 1147440
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A quick non-algebraic method for solving mixture problems like this....<br>
(1) The target of 16% is 3/7 of the way from 13% to 20%.  (Picture the three percentages on a number line: 13 to 16 is 3; 13 to 20 is 7; 16 is 3/7 of the way from 13 to 20.)<br>
(2) That means 3/7 of the mixture is the higher percentage ingredient.<br>
That 3/7 of the mixture is 3 ounces, so the other 4/7 of the mixture is 4 ounces.<br>
ANSWER: 4 ounces of the 13% solution