Answer:
B,C,D,E is simplest form.
Explanation:
A.
which needs to get derived into simplest form.
But
B. 27:28 = 27:28
C. 9:7 = 9:7
D. 19:12 = 19:12
E. 10:7 = 10:7 does not require to get derives into simplest form.
the ratios which are in simplest form
B. 27 : 28
C. 9 :7
D. 19 : 12
E. 10 : 7
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