Red waters volume is 15 liter and blue waters volume is 25 liter compared volume red water and blue water is ...

Red Water = 15 liter
Blue water = 25 liter

compared?

red water : blue water
         15    :      25      ------> : 5
           3    :     5
        

Red waters : Blue waters = 15 liter : 25 liter
then it can be shared 5 be 3 : 5

hopefully help ^_^