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no 19. 1 2/3 (satu dua per tiga)
no 20. 7,561

19.
2 1/2 : 1 1/2
= 5/2 : 3/2
= 5/2 x 2/3
= 10/6
= 5/3 (B)

20.
3,125 + 12,776 - 8,34
= 15,901 - 8,340
= 7,561 (C)