Correct Answer - Option 4 : 13.5%
GIVEN:
Initial solution = 18 l
Water evaporated = 6 l
Sugar % = 9%
CONCEPT:
When the solution is boiled only water evaporates and the amount of sugar remains the same.
CALCULATION:
Amount of sugar,
9% of 18 = 1.62
After evaporation,
Remaining solution = 18 - 6 = 12 l
% of sugar in remaining solution,
⇒ 1.62/12 × 100
= 13.5%