In seawater there is 5% of salt. How many liters of fresh water do you need to add to 30 liters of seawater to get a 1.5% solution of salt?

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01-02-2018
Mathematics

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In seawater there is 5% of salt. How many liters of fresh water do you need to add to 30 liters of seawater to get a 1.5% solution of salt?

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zrh2sfo zrh2sfo · Answer 1 · 2018-02-05T03:39:49+01:00

zrh2sfo zrh2sfo

05-02-2018

Let x = amout of fresh water required
The amount of the salt remains the same
.05(30) = .015(x+30)
1.5 = .015x + .45

1.5 - .45 = .015x
1.05 = .015x
x = 1.05/.015
x = 70 liters of fresh water

check solution
.05(30) = .015(100)
1.5 = 1.5

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