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The average of first four numbers out of five numbers is 18 whereas average of last four numbers out of same five numbers is 13. If the first number is 23 then what is the last number?

The average of first four numbers out of five numbers is 18 whereas average of last four numbers out of same five numbers is 13. If the first number is 23 then what is the last number? Correct Answer 3

Total sum of the first four numbers out of five numbers is

18 × 4 = 72

Total sum of the last four numbers out of five numbers is

13 × 4 = 52

Total sum of second, third and fourth numbers is

72 – 23 = 49

The last number out of five numbers is

52 – 49 = 3

Hence, the last number is 3.

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