Question 437599
------	Percent	----------------	quantity										
Antifreeze	15	----------------90								
Antifreeze	90	----------------x								
Total	80	----------------	90	+	x								
													
15*90+90*x=80(90+x)										
1350+90x=7200+80x				
90x-80x	=7200-1350					
10x=5850								
/10									
x=585	gallons	90	%	Antifreeze