college algebra (maths 112)
posted by Anonymous .
To conduct a new experiment, a scientist needs a 23% salt water solution. How much of a 13% solution must be mixed with 45 quarts of a 32% solution to get the proper solution?

.13A+.32*45=.23(A+45)
can you solve for the volume of A? 
actually this is only freshman (HS) math but i still don't remember how to do it