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After 38 liters of petrol were poured into the tank, it was still 5% empty. How much petrol must be poured into the tank in order to fill it?

Correct answer: D. 2 liters

  • A. 38 liters
  • B. 40 liters
  • C. 38.5 liters
  • D. 2 liters

Explanation

The 38 litres poured in represent 95% of the tank because the tank is still 5% empty. Therefore, the tank capacity is 38/0.95 = 40 litres, and the remaining 5% is 5/100 x 40 = 2 litres. The likely trap is 38 litres, which treats the amount already poured in as the amount still needed.

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