<PRE><B>Question 153023</B>
 “Attack” is 2% acid and “Blast” is 6% acid. They want to mix the two to get 60qt of a solution that is 5% acid. How many quarts of each should they use? 
:
Let x = the amt 6% acid stuff
then
(60-x) = the amt of 2% acid stuff
:
Write the decimal equiv equation:
.06x + .02(60-x) = .05(60)
:
.06 x + 1.2 - .02x = 3
:
.06x - .02x = 3 - 1.2
:
.04x = 1.8
x = {{{1.8/.04}}}
x = 45 qts of 6% acid
then
60 - 45 = 15 qts of 2% acid
:
:
Check solution in original equation:
.06(45) + .02(15) = .05(60)
   2.7 +  .3  = 3</PRE>