SOLUTION: You pour 2 gallons of 5% bleach into 3 gallons of 20% bleach.What is the percentage in this new mixture? (Hint: 3x3 chart may be helpful)

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Question 741108: You pour 2 gallons of 5% bleach into 3 gallons of 20% bleach.What is the percentage in this new mixture?

(Hint: 3x3 chart may be helpful)
Found 3 solutions by Alan3354, josmiceli, josgarithmetic:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
You pour 2 gallons of 5% bleach into 3 gallons of 20% bleach.What is the percentage in this new mixture?
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2*5 + 3*20 = 5*C
5C = 70
C = 14% concentration

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+.05%2A2++=+.1+ gallons of bleach in 5% mixture
+.2%2A3+=+.6+ gallons of bleach in 20% mixture
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+%28+.1+%2B+.6+%29+%2F+%28+2+%2B+3+%29+=+.7%2F5+
+.7%2F5+=+14%2F100+
The new mixture is 14% bleach

Answer by josgarithmetic(39838) About Me  (Show Source):
You can put this solution on YOUR website!
Another hint is these two question:
How much bleach? How much mixture? The ratio is the concentration of bleach.

How much bleach: 2*5%+3*20%

How much mixture: 2 gallons + 3 gallons = 5 gallons

Percent bleach in the mixture: %282%2A5%2B3%2A20%29%2F%282%2B3%29=PercentBleachMixture