SOLUTION: A gallon of chlorox bleach is lebeked "5.25% sodium hypochlorite by weight." if a gallon of bleach weigh 8.3 lbs, then how many lbs. of pure sodium hypochlorite must be added so th

Algebra ->  Customizable Word Problem Solvers  -> Mixtures -> SOLUTION: A gallon of chlorox bleach is lebeked "5.25% sodium hypochlorite by weight." if a gallon of bleach weigh 8.3 lbs, then how many lbs. of pure sodium hypochlorite must be added so th      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


   



Question 1020349: A gallon of chlorox bleach is lebeked "5.25% sodium hypochlorite by weight." if a gallon of bleach weigh 8.3 lbs, then how many lbs. of pure sodium hypochlorite must be added so that the bleach will be 7% sodium hypochlorite?
Found 2 solutions by josgarithmetic, josmiceli:
Answer by josgarithmetic(39621) About Me  (Show Source):
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = pounds of pure sodium hypochlorite
to be added
+.0525%2A8.3+=+.43575+ pounds of pure sodium hypochlorite
in a gallon of chlorox bleach
----------------------------
+%28+x+%2B+.43575+%29+%2F+%28+x+%2B+8.3+%29+=+.07+
+x+%2B+.43575+=+.07%2A%28+x+%2B+8.3+%29+
+x+%2B+.43575+=+.07x+%2B+.581+
+.93x+=+.14525+
+x+=+.1562+
.1562 pounds of pure sodium hypochlorite must be added
---------------
check:
+%28+x+%2B+.43575+%29+%2F+%28+x+%2B+8.3+%29+=+.07+
+%28+.1562+%2B+.43575+%29+%2F+%28+.1562+%2B+8.3+%29+=+.07+
+.592+%2F+8.456+=+.07+
.070008+=+.07+
OK -close enough