Question 1154192
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Here is a quick and easy way (if you understand it!) to solve two-part mixture problems like this.<br>
(1) 30% is "twice as close" to 40% as it is to 10%.  (The difference between 40 and 30 is half the difference between 30 and 10.)<br>
(2) That means the mixture needs to use twice as much of the 40% acid as the 10% acid.<br>
(3) Twice as much means 2/3 of the mixture needs to be the 40% acid, so 1/3 is the 10% acid.<br>
ANSWER: 2/3 of 8 liters, or 16/3 liters, of 40% acid; 1/3 of 8 liters, or 8/3 liters, of 10% acid.<br>