Question
Asked Sep 11, 2019
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How many gallons of a 60​% antifreeze solution must be mixed with 60 gallons of 20​% antifreeze to get a mixture that is 50​%
​antifreeze? Use the​ six-step method.
You need ________gallons.
 
​(Round to the nearest whole​ number.)
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Expert Answer

Step 1

Let the number of gallons of 60% antifreeze be ‘x’.

60 gallons of 20% antifreeze and total volume = 60 + x

Step 2

According to the ...

60x 20 x 60
50(60 +x)
60x1200 3000 50x
60x 50x 3000 -1200
10x 1800
x 180 gallons
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60x 20 x 60 50(60 +x) 60x1200 3000 50x 60x 50x 3000 -1200 10x 1800 x 180 gallons

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