Average of five numbers is 73. The average of the first two numbers is 92 and the average of the last two numbers 89.5. Find the value of the third number.

The total sum of all five numbers is 5 times 73, which equals 365. The sum of the first two numbers is 2 times 92, giving 184. The sum of the last two numbers is 2 times 89.5, which equals 179. The third number is found by subtracting these sums from the total, so 365 minus 184 minus 179 gives 2.

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