SOLUTION: How many liters of pure baking soda must be added to 200 liters of a 30% baking soda solution to get a 60% baking soda solution?

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Question 583841: How many liters of pure baking soda must be added to 200 liters of a 30% baking soda solution to get a 60% baking soda solution?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = liters of pure baking soda needed
+.3%2A200+=+60+ liters of baking soda in 30% solution
-----------
+%28+60+%2B+x+%29+%2F+%28+200+%2B+x+%29+=+.6+
+60+%2B+x+=+.6%2A%28+200+%2B+x+%29+
+60+%2B+x+=+120+%2B+.6x+
+.4x+=+60+
+x+=+150+
150 liters of pure baking soda are needed
check:
+%28+60+%2B+150+%29+%2F+%28+200+%2B+150+%29+=+.6+
+210+%2F+350+=+.6+
+210+=+.6%2A350+
+210+=+210+
OK