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Mathematics 46 Online
BexleyBrooks:

A 5 gallon container contains an alcohol-water solution that contains 25% of pure alcohol. how much pure alcohol should be added to create a solution that has a concentration of 40% alcohol?

luhsky25:

25

judethedude:

When you are giving an answer to a problem like this don't just give the answer please, explain it and go through the process.

judethedude:

especially a wrong answer.

judethedude:

your solving for the amount of pure alcohol that needs to be added. you are given a 5 gallon container that is full of an alcohol-water solution that is 25% of pure alcohol. the desired amount is 40%.

judethedude:

first, 5 gallons times 0.25 then let x show the amount of alcohol that needs to be added. with this set up an equation

judethedude:

1.25 gallons + x = 0.40(5+x)

judethedude:

solve for x = 1.25

ykbatman:

1.25

ykbatman:

is da answer

judethedude:

I wonder where you got that from

ykbatman:

I did the equation

ykbatman:

in my head

judethedude:

hope this could help brooks !

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