# Sea water

Seawater contains about 4.3% salt. How many dm3 of distilled water we must pour into 5 dm3 of sea water to get water with 1.8% salt?

Correct result:

V =  6.94 dm3

#### Solution:

$4.3 \% \cdot \ 5=1.8 \% \cdot \ (5+V) \ \\ 4.3/100 \cdot \ 5=1.8/100 \cdot \ (5+V) \ \\ \ \\ 4.3 \cdot \ 5=1.8 \cdot \ (5+V) \ \\ \ \\ 1.8V=12.5 \ \\ \ \\ V=\dfrac{ 125 }{ 18 } \doteq 6.944444=6.94 \ \text{dm}^3$

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