# The average of 5 numbers is 18.4. the average of first 3 numbers is 12 and the average of the last three numbers is 30. find the third number.

The sum of 5 numbers is 5 x 18.4=92

The sum of the first three numbers = 12 x 3=36

Therefore the sum of the last two numbers= 92-36=56

The sum of the last three numbers = 30 x 3=90

Therefore the sum of the first two numbers= 92-90=2

Then the third number is= The sum of 5 numbers-(Therefore the sum of the first two numbers+Therefore the sum of the last two numbers)

=92-(2+56)=92-58=34

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