Question 425549
-------------	percent	----------------quantity		
acid solution	20	----------------100
pure acid	100	----------------x
Total	50	----------------	100+x
............
20*100+100*x=50(100+x)
										
2000+100x=5000+50x					
100x-50x=5000-2000					
50x=3000
/50									
x= 60	ml	100%acid solution