77-10=66
66-9=57
57-8=49
subtract ten then nine then eight then seven then six and so on
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39, 48, 57, 66
66
If 11 + X = 77, X = 66. What you have to do is 77 - 66, and that = 11!
66/35 ÷ 77/30 = 1980/2695 which is simplified to 36/49.
6/7