Question 1179771
<pre><font face = "consolas" color = "indigo" size = 3><b>
Hi
.30(90-x) + .60x = .55(90)
               x = .25(90)/.30 = 75gal 60%  and 15gal 30%

  4.5 + 45 = 49.5  checks.
Wish You the Best in your Studies.
</font></b></pre>