<PRE><B>Question 557073</B>
you have to prepare a 2L of 3% bleach and water solution, how many cups of bleach and water do you need?
:
Let w = amt of water required
then
(2-w) = amt of bleach
:
An amt of bleach equation
(2-w) = .03(2)
2 - w = .06
-w = .06 - 2
-w = -1.94
w  = 1.94 liters of water; 
and
2 - 1.94 = .06 liters of bleach
:
But I see you want to know how many cups. 
1 liter = 4 cups
1.94(4) ~ 7{{{3/4}}} cups of water
.06(4) ~ {{{1/4}}} cup bleach</PRE>