Algebra 1, finding average

Question

the sum of four numbers is 411.6. two of the numbers are 20.4 and 270.5. find the average of the four numbers.

Answer 1

Since we are already given the sum of the four numbers, we just need to divide that sum by 4, so 411.6/4 = 102.9 is the average. The given values of two of the numbers are hence irrelevant.

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