A litre of water evaporates from 6L of sea water containing 4% salt. Find the percentage of salt in the remaining solution.

A. $$5\frac{1}{2}\% $$

B. $$3\frac{1}{2}\% $$

C. 3%

D. $$4\frac{4}{5}\% $$

Answer: Option D

Solution(By Examveda Team)

$$\eqalign{ & {\text{Quantity of salt in 6L of sea water,}} \cr & = \frac{{ {6 \times 4} }}{{100}} = 0.24 \cr & {\text{Percentage of salt in 5L of sea water,}} \cr & = \frac{{ {0.24 \times 100} }}{5} = 4\frac{4}{5}\% \cr} $$