Question 1199752
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If a formal mathematical solution is required, then something like the setup shown by the other tutor is standard.<br>
If formal math is not required, and if the speed of finding the answer is important, here is a quick and easy way to solve any 2-part mixture problem like this:<br>
16% is 6/10 = 3/5 of the way from 10% to 20%;
therefore 3/5 of the mixture should be the ingredient with the higher percentage.<br>
ANSWER: 3/5 of 30mL, or 18mL, of the 20% solution; the other 12mL of the 10% solution<br>
CHECK:
.20(12)+.30(18) = 3.6+5.4 = 9.0
.30(30) = 9.0<br>