A tank contains 10000 gallons of water out of which 5% is sodium chloride.…
2024
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?
- A.
4.32%
- B.
6.67%
- C.
11%
- D.
12.33%
Attempted by 2463 students.
Show answer & explanation
Correct answer: B
Key idea: evaporation removes only water, so the amount of sodium chloride stays the same while the total volume decreases.
Step 1: Calculate amount of sodium chloride: 10000 × 5% = 500 gallons.
Step 2: Calculate remaining volume after evaporation: 10000 − 2500 = 7500 gallons.
Step 3: Compute the new concentration: (500 ÷ 7500) × 100 = 6.666…% ≈ 6.67%.
Answer: 6.67%