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Evapotranspiration is measured using lysimeter, thermometer measures temperature, hygrometer measures relative humidity, anemometer measures wind speed.
The average of five consecutive odd numbers is 53. What is the average of the first three numbers among them?
The average age of a class of 20 girls is 14 years. If 5 new girls having average age of 9 years join the class, then the average age of the class becomes: