A tank contains 10000 gallons of water out of which 5% is sodium chloride.…

2023

A tank contains 10000 gallons of water out of which 5% is sodium chloride. When 2500 gallons water is evaporated, remaining solution contains what percent of sodium chloride ?

  1. A.

    4.32%

  2. B.

    6.67%

  3. C.

    11%

  4. D.

    12.33%

Attempted by 5 students.

Show answer & explanation

Correct answer: B

Answer: 6.67%

  1. Calculate the initial amount of sodium chloride: 10000 × 5/100 = 500 gallons.

  2. When 2500 gallons of water evaporate, only water is removed; the sodium chloride amount stays 500 gallons.

  3. Remaining solution volume = 10000 − 2500 = 7500 gallons.

  4. New percentage of sodium chloride = (500 / 7500) × 100 = 6.666... ≈ 6.67%.

Therefore the remaining solution contains 6.67% sodium chloride.

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