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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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Percentages express a quantity as parts per hundred and support calculations involving increases, decreases, discounts, commissions, taxes, and successive changes. Questions require distinguishing percentage change from percentage points and identifying the original value when a final value and its percentage change are given.

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