Library / /164 of 413

, 2004

Number theory Difficulty 1.0 Junior Find the answer Canada

If $800\,670 = 8\times10^x + 6\times10^y + 7\times10^z$ , where $x$ , $y$ and $z$ are whole numbers, then $x+y+z$ equals

(A) $11$ (B) $8$ (C) $6$ (D) $3$ (E) $5$

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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.