Multiple choice

A 200-liter tank contains a mixture of 60% oil and 40% water. If 10 liters of oil are added, what will the approximate percentage of oil in the mixture become?

  1. 60%

  2. 62%

  3. 65%

  4. 70%

  5. 72%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Initial oil = 0.6 * 200 = 120 liters. New oil = 120 + 10 = 130 liters. New total = 200 + 10 = 210 liters. New percentage = (130 / 210) * 100 = 61.9%. Rounded, this is 62%.

AI explanation

The initial tank has 200 litres of a mixture containing 60 percent oil, so the volume of oil is 0.60 times 200, which is 120 litres. Adding 10 litres of oil brings the total oil to 130 litres and the total mixture volume to 210 litres. The new percentage of oil is 130 divided by 210 times 100, which is approximately 61.9 percent. Rounding to the nearest whole number gives approximately 62 percent.

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