Question 1039677
<a href="https://www.algebra.com/my/Mixtures%3A-All-in-Symbols.lesson?content_action=show_dev">LESSON: Mixing two concentrations for known amount of mixture </a>


This can be done using just one single variable instead of two variables.  You want volume of 93 liters, so if maybe v is the volume to use of the higher concentration material, then 93-v is the volume to use of the lower concentration material.  NOW you can write ONE equation in just ONE variable.