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A vat contains 60 gallons of a 15% saline solution. How many gallons of water must be evaporated so that the resulting solution will be 20% saline?

User Amicngh
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1 Answer

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To solve this problem we can use proportion.
60 gallons -----------100%
x-------------------------15%

x= (60*15)/(100) = 9 gallons of saline.
Now we can use this knowledge and create second proportion
9 galllons -------------20%
x-------------------------100%


x= (9*100)/(20)=45 galloons
Now we can just find the difference (evaporated gallons)
60-45=15 - its our result.

User Farbod Ahmadian
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8.6k points
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