average of 4 numbers is 11 so 11*4 = 44
average of 5 numbers is 12.4 so 12.4*5 = 62
the 5th number = 62-44 = 18
The value of the fifth number will be 18.
Since the average of five numbers is 12.4, their total value will be:
= 12.4 × 5 = 62
Since the average of four of these numbers is 11, their total value will be:
= 11 × 4 = 44
Therefore, the value of the last number will be:
= 62 - 44 = 18
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