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?

Question

Mathematics

Yair Collins

11 February, 07:31

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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Answers (1)

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Lexi May · Answer 1

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