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An ammonia and water mixture fills a five-gallon container. Eighty percent of the mixture is ammonia but some of the mixture will be drained and replaced with pure water. If a fivegallon mixture of fifty percent ammonia is desired, how many quarts of the mixture need to be drained before the water is added? (A quart is onefourth of a gallon.)

 Jun 2, 2020
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Amount of ammonia to start    .8 ( 5 gal)

 

drain some amount x to replace with water

 

amount of ammonia  removed  = .8x

 

add water then have 5 gallons of 50%      =    .5 (5)

 

.8(5)  - .8x = .5 (5)         x is the amount removed and replaced with water (in GALLONS....You will need to convert to quarts)

 Jun 2, 2020

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