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, 2002

Algebra Difficulty 2.0 Junior Find the answer Canada

The integers from 1 to 9 are listed on a blackboard. If an additional $m$ eights and $k$ nines are added to the list, the average of all of the numbers in the list is 7.3. The value of $k+m$ is

(A) $24$ (B) $21$ (C) $11$ (D) $31$ (E) $89$

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.