7/10 + 5/10 = 12/10 or 1.2 or 1 1/5.
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7/10 + 7/10 = 7/5
1/5 plus 1/7 plus 3/10 is equal to 0.642857
3/5 + 7/10 = 6/10 + 7/10 = 13/10 = 1 and 3/10
If 2 + 3 = 5 = 10(base 5), then 9 + 7 = 16 = 31(base 5).
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55