<PRE><B>Question 383908</B>
how many gallons of water must be added to 20 gallons of 15% salt solution
if the resulting solution is to only contain 11% salt
:
Let x = amt of water required
.15(20) = .11(x+20)
 3 = .11x + 2.2
3 - 2.2 = .11x
.8 = .11x
x = {{{.8/.11}}}
x = 7.273 gal
:
:
See if that is true, the amt of salt should be the same
.15(20) = .11(27.273)
3 ~ 3.00</PRE>