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Algebra Difficulty 1.0 Junior Find the answer Canada

Amos is reading a $400$ page book. On Monday, he reads $40$ pages. On each day after the first, the number of pages that he reads is $20$ more than on the previous day. Amos finishes the book on

(A) Friday (B) Saturday (C) Sunday (D) Monday (E) Thursday

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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.