Question 1132117
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Let me expand a bit on the very good solution provided by tutor @boreal.<br>
In his response, he showed two different ways to get the answer.<br>
In his first line, he got almost to the solution in just that one line; he could have gotten all the way to the solution with one line:<br>
61% is 2/3 of the way from 45% to 69%; therefore 2/3 of the mixture should be the 69%; 2/3 of 150 liters is 100 liters.  So 100 liters of 69% and 50 liters of 45%.<br>
Then in his next 7-8 lines he shows a traditional algebraic solution for mixture problems.<br>
Look at the amount and complexity of the work in the algebraic solution method compared to the informal first method.<br>
The lesson here is that, if a formal algebraic solution is not required, there is a much faster and easier path to the answer.