GAUSS8 2002 Problem 6

Past Contests GAUSS8 GAUSS (GR. 8) - 2002
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1

Qaddama is 6 years older than Jack. Jack is 3 years younger than Doug. If Qaddama is 19 years old, how old is Doug?

Answer Choices
A. 17
B. 16
C. 10
D. 18
E. 15