Multiple choice

An empty fuel tank of a car was filled with A type of petrol. When the tank was half empty, it was filled with B type of petrol. Again when the tank was half empty, it was filled with A type of petrol. When the tank was half empty again, it was filled with B type of petrol. At this time, what was the percentage of A type of petrol in the tank?

  1. 50%

  2. 40%

  3. 33.5%

  4. 37.5%

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
AI explanation

Assume the tank capacity is 16 units, starting entirely with type A petrol. After the first replacement it has 8 units of A and 8 of B, and after the second it has 12 of A and 4 of B. Following the third replacement, it holds 6 units of A and 10 of B. The percentage of type A is (6/16) times 100, which equals 37.5 percent.

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