2 answers:
Common denominator is 10
51/2 × 5 = 255/10
11/5 × 2 = 22/10
255/10 + 22/10 = 277/10
277/10 or 27 7/10
51/2 = 25.5
11/5 = 2.2
25.5 + 2.2 = 27.7 or 27 7/10
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