9. (a) Explain the quickest method of finding the average price per kilo of wheat for 20 years when the given data gives the number of kilo per rupee for 10 years and the price in rupee per kilo for next 10 years. (b) and he gets a mileage of only 10 miles per gallon of gasoline. On the return trip he makes 15 miles per gallon. Find the harmonic mean of his mileage. Verify the fact that this is the proper average to use by assuming that the distance from A to B is 60 miles. A man motors from A to B. A large part of the distance is uphill

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