Math CentralQuandaries & Queries


Question from rizza, a parent:

The average of 9 numbers is 45. If 90 and 88 are added to the set of numbers. What will be the resulting average?

H Rizza,

I can get you started.

Suppose the sum of the 9 numbers is $S$ then

\[\frac{S}{9} = 45.\]

What is $S?$


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