Library / /34 of 413

, 1999

Number theory Difficulty 1.0 Junior Find the answer Canada

In the subtraction question, $\begin{array}{r}1957\\-\;a9\\\hline 18b8\end{array}$ , the sum of the digits $a$ and $b$ is

(A) $15$ (B) $14$ (C) $10$ (D) $5$ (E) $4$

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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.