Question 561093
	percent	----------------	quantity								
Acid solution	12	----------------51	cc					
Pure acid	100	----------------x	cc					
Mixture	15	----------------51	+	x	cc					
											
12*51+100x=15(51+x)
612+100	x=765+15x			
100x-15x=765-612				
85	x	=	153								
/	85										
x=	1.8	cc	of 	Pure acid