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Need help with 18- 23 . I tried doing them but come up with different answers not on the paper

Need help with 18- 23 . I tried doing them but come up with different answers not-example-1
User Hasif Seyd
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18. 2/7 or b

19. 3/4 or b

20. Unable to see

21. 9/20 or a

22. 1/4 or a

23. 27/35 or b

User Matthias Samsel
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7.9k points

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