Question 1092435
<br>I see you got two previous responses to your question.  In the first, the focus was to chastise you for using the term "pure saline"; in the second, the focus of the response was on changing liters to grams.  And in the second response, you were shown an equation you could use to solve the problem -- even though you specifically asked not to be.  And the equation was shown with no explanation; so it would not have been any help if you needed help actually setting up and solving the problem.<br>
But neither response answered your two specific questions....<br>
So, for A, as long as you mean
x = number of liters OF 15% saline solution
(instead of number of liters IN 15% saline solution)
then yes, that would be the most logical choice for a variable, since it is exactly what the problem asks you to find.<br>
And your calculation for part B is fine.