SOLUTION: if a chemist uses 77 milliliters of water, how many milliliters of reagent will she need to make 30% solution?

Algebra ->  Customizable Word Problem Solvers  -> Mixtures -> SOLUTION: if a chemist uses 77 milliliters of water, how many milliliters of reagent will she need to make 30% solution?      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 786193: if a chemist uses 77 milliliters of water, how many milliliters of reagent will she need to make 30% solution?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = ml of reagent
+x+%2F+%28+77+%2B+x+%29+=+.3+
+x+=+.3%2A%28+77+%2B+x+%29+
+x+=+23.1+%2B+.3x+
+.7x+=+23.1+
+x+=+33+
33 ml of reagent are needed