Question 917346
---	percent	----------------	Amount									
acid	24	----------------			18	liters						
water	0	----------------			x	liters						
Mixture	15	----------------	18	+	x	liters						
												
24	*	18	+	0	x	=	15	(	18	+	x	)
432	+	0	x	=	270	+	15	x				
0	x		-15	x	=	-432	+	270				
-15	x	=	-162									
/	-15											
x	=	10.8		liters	water