Question 1010254
One store, 1.2Q liters of apple cider
Second store, Q liters of apple cider


A sale rate is given for each store.
One store, 90 LITERS per HOUR;
Second store, 80 LITERS per HOUR.


A 2.5 hour time quantity of volume sales was described. 


How much is at One store is  {{{1.2Q-90*2.5}}} liters.
How much at second store, is  {{{Q-80*2.5}}} liters.


Second store HAD 65 liters less than One store in the time quantity described.   {{{highlight(Q-80*2.5=-65+1.2Q-90*2.5)}}}.


If this equation makes sense, and you can see the path, understand the path to create it, then THAT is most of the problem solution.  Just solve for Q.