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> そして、調べた **７７の海岸のうち６０％で** 、砂が全部なくなる可能性があることがわかりました。  
>  In 60% of the 77 coasts investigated, it is understood that there is a
> possibility that all the sand will be lost.

I'm a bit confused by the 調べた７７の海岸のうち６０％で part. I'm assuming it means "in 60%
of the 77 coasts investigated", but I'm uncomfortable with the lack of
particle between うち and 60%. How do the following differ:

> ７７の海岸のうち６０％で  
>  ７７の海岸のうちの６０％で this one feels ungrammatical to me  
>  ７７の海岸の６０％で

Maybe I'm trying to join ７７の海岸のうち and 60% into a single phrase when I
shouldn't. Perhaps the correct answer is "Among the 77 coasts investigated, in
60% of them ...". Could I write ７７の海岸のうち、それの６０％で with the same meaning as the
original?
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2019-01-04T14:13:24.110
64723
2019-01-06T02:44:02.257
7944
question
reading-comprehension
Understanding ７７の海岸のうち６０％で、
>   * 77の海岸のうち60%で
>   * 77の海岸のうちの60%で
>   * 77の海岸の60%で
>

These all mean the same thing, and they are interchangeable. うち is basically a
noun, but it can form an adverbial phrase or clause without another particle,
just as 時, 中 can 場合 can do so.

From 明鏡国語辞典:

> ### うち
>
> ⑩㋑ 問題とする数値がある範囲の中から選ばれたことを表す。  
>  「仲間のうち二人が合格した」「定価のうち（の）二割を内金として払う」「三人残ったうちの一人が犯人だ」

うち is often optional, but it can remove an ambiguity from a sentence. For
example, 友達の2人 means either "the two friends (mentioned in the conversation)"
or "two of the (many) friends" depending on the context. 友達のうちの2人 only means
the latter.
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2019-01-06T02:44:02.257
64743
2019-01-06T02:44:02.257
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64723
answer