Question 419057
percent	----------------	quantity
25	----------------	x
50	----------------	30-x
40.00%	----------------	30

..............

25x+50(30-x)=40	*30
25x+1500-50x=1200		
25x-50x	=1200-1500		
-25x=-300							
/-25										
x=12liters of	25.00%		
18 liters of 50.00%