28. 3a = 27
b. 8
C. 9
a. 7
b. 12.
C. 20
29. 60 = 6b
a. 10
30. 1 + n = 25
2
a. 39
b. 59
C. 49
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28. 3a = 27
b. 8
C. 9
a. 7
b. 12.
C. 20
29. 60 = 6b
a. 10
30. 1 + n = 25
2
a. 39
b. 59
C. 49
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