17. 25:n = 75:12
18. 12:125 = n:250
19. 45:80 = 90:n
20. 20:n = 70:63
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17. 25:n = 75:12
18. 12:125 = n:250
19. 45:80 = 90:n
20. 20:n = 70:63
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Answer:
17.n=4
18.n=24
19.n=160
20.n=18
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