For adding fractions, you need to make both denominators the same, then add the numerators. In this case 5/6 and 4/6 have the sum 9/6, which can be simplified to 1 1/2 (fractions are difficult in these answer windows).
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5/30 + 4/6 = 1/6 + 4/6 = 5/6
4 + 6 + 6 + 5 + 5 + 4 + 6 + 5 + 5 + 6 + 5 + 5 + 5 + 3 = 70
1/6 + 4/6 = 5/6 (five sixths)
1.75 or 13/4
3/4 + 5/6 = 9/12 + 10/12 = 19/12 = 17/12