UPSC Prelims 2013·CSAT·Quantitative Aptitude·Arithmetic

The tank-full petrol in Arun's motor-cycle lasts for 10 days. If he starts using 25% more everyday, how many days will the tank-full petrol last?

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Last updated 8 Jul 2026, 4:39 pm IST
  1. A5
  2. B6
  3. C7
  4. D8Correct

Explanation

The total petrol in the tank is constant. Let the initial daily consumption be 'C' units. The petrol lasts for 10 days, so the total petrol in the tank is 10 * C units.

If he starts using 25% more everyday, his new daily consumption (C') will be: C' = C + 25% of C = C + 0.25C = 1.25C units.

To find how many days the tank-full petrol will last with the new consumption, divide the total petrol by the new daily consumption: Number of days = (Total petrol) / (New daily consumption) Number of days = (10 * C) / (1.25 * C) Number of days = 10 / 1.25 Number of days = 8.

Therefore, the petrol will last for 8 days.

Analyzing the options: A) 5: Incorrect. This would imply a much higher increase in consumption. B) 6: Incorrect. C) 7: Incorrect. D) 8: Correct, as calculated.

The final answer is D

Quantitative Aptitude: The tank-full petrol in Arun's motor-cycle lasts for 10 days. If he starts using 25% more everyday, how many days will t
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