NDA 2024 Mathematics question
An edible oil is sold at the rates 150, 200, 250, 300 rupees per litre in four consecutive years. Assuming that an equal amount of money is spent on oil by a family in every year during these years, what is the average price of oil in rupees (approximately) per litre?
Answer: (A)
Solution
When the same amount of money is spent each year, the average price per litre is total money divided by total quantity, i.e. the harmonic mean of the rates.
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