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%⋅ 5=1.8%⋅ (5+V) 4.3/100⋅ 5=1.8/100⋅ (5+V)  4.3⋅ 5=1.8⋅ (5+V)  1.8V=12.5  V=12518≐6.944444=6.94 dm3

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