Qaddama is 6 years older than Jack. Jack is 3 years younger than Doug. If Qaddama is 19 years old, how old is Doug?
(A) 17 (B) 16 (C) 10 (D) 18 (E) 15
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Source: CEMC, University of Waterloo,
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Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.