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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