Solution A has 5% salt concentration and remaining water. After heating 50 litres of Solution A at a certain temperature, due to evaporation, the salt concentration increases to 10%. The amount of water remaining in the solution would be
Options:
A) 30 litres  B) 27 litres  C) 25 litres  D) 22.5 litres  E) 20 litres
Before Evaporation:   Salt : 5% of 50 litre = 2.5 litre   Water: 95% of 50 litre = 47.5 litre   After Evaporation:   Salt concentration is 10%. Now the salt content will not change after evaporation. So 2.5 litre = 10% of 25 litre.   Hence, remaining water = 25 litre - 2.5 litre = 22.5 litre   Answer is 22.5 litres
<result>D</result>
Solution A has 5% salt concentration and remaining water. After heating 50 litres of Solution A at a certain temperature, due to evaporation, the salt concentration increases to 10%. The amount of water remaining in the solution would be