I'd write "two thirds". I don't understand the hyphen, unless it's used as in "a two-thirds majority".
Why is 's' not omitted when 'two-thirds' is an adjective? Is this because it is a fraction?"a two-thirds majority"
I don't know. A walk of two miles is a two-mile walk. But a majority of two thirds is a two-thirds majority. It might be an exception but that's how we say it.Why is 's' not omitted when 'two-thirds' is an adjective? Is this because it is a fraction?
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