Question 7

# The average of 9 numbers is 40. If the average ofthe first five numbers is 38 and that of the last five is 50, then what is the fifth number?

Solution

Sum of 9 numbers = $$9\times40=360$$

Sum of 1st five numbers = $$5\times38=190$$

Sum of last five numbers = $$5\times50=250$$

Fifth number = (250+190)-360=80

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