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If 6 liters of water is evaporated on boiling from 18 liters of sugar solution containing 9% sugar, then find the percentage of sugar in the remaining solution. 
1. 15%
2. 10%
3. 20%
4. 13.5%
5. 12.5%

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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%

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