SOLUTION: if 5 ounces of medicine has to be mixed with 8 ounces of water, how many ounces of medicine needs to be added to 20 ounces of water?

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Question 838346: if 5 ounces of medicine has to be mixed with 8 ounces of water, how many ounces of medicine needs to be added to 20 ounces of water?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Use a ratio:
+5%2F8+=+x%2F20+
Multiply both sides by +8%2A20+
+5%2A20+=+8x+
+8x+=+100+
+x+=+12.5+
12.5 ounces of medicine needs to be
added to 20 ounces of water