Question 424837
	percent	----------------quantity		
Saline	2	----------------50
Saline	20	----------------x
Total	10	----------------50+x
...
2*50+20*x=10(50+x)								
100+20x=500+10x					
20x-10x	=500-100					
10x=400
/10									
x=40 ounces of 20% Saline