Answer:
36 books in 12 weeks
Explanation:
All you have to do is multiply 3 books a week by 12 weeks....
1 week 3b 7 weeks 21b
2 weeks 6b 8 weeks 24b
3 weeks 9b 9 weeks 27b
4 weeks 12b 10 weeks 30b
5 weeks 15b 11 weeks 33b
6 weeks 18b 12 weeks 36b
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