A) 10 kg
B) 20 kg
C) 30 kg
D) 40 kg
Correct Answer: D
Solution :
Let x kg of fresh water is added to sea water. \[\frac{{{q}_{salt}}}{({{q}_{salt}}+{{q}_{water}})}=\frac{5%\,\,\text{of}\,60}{60+x}=\frac{3}{100}\] (given, 3% salt in solution) \[\Rightarrow \] \[\frac{3}{60+x}=\frac{3}{100}\] \[\therefore \] \[x=40\,\,kg\] So, 40 kg of fresh water must be added to sea water.
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