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It depends:
7/8/9/10 can be:
7/(8/(9/10)) = 7/(80/9) = 63/80, or
7/((8/9)/10) = 7/(8/90) = 7/(4/45) = 315/4
(7/8)/(9/10) = 70/72 = 35/36
(7/(8/9))/10 = (63/8)/10 = 63/80
((7/8)/9)/10 = (7/72)/10 = 7/720
* * * * *
There is an "and" between 8 and 9 so the question, in fact, refers to 7/8 + 9/10 which is not ambiguous.
7/8 + 9/10 = 35/40 + 36/40 = 71/40 = 1 and 31/40
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