数十 and 多数: a scale of several tens and a large number
Compare the scale expressed by 数十人 with the assessment 多数, without inventing an exact participant or exhibit count.
A scale of several tens
数十, read すうじゅう, means several tens. 会場には数十人の参加者が集まった。 reports that several tens of participants gathered at the venue.
数十人 gives an approximate scale in tens. It does not establish exactly thirty or fifty participants.
Assessing a number as large
多数, read たすう, indicates a large number. 会場には多数の応募作品が展示されている。 says that many submitted works are on display at the venue.
多数の作品 does not fix an exact count or a scale of tens. Check numbers and counters when a precise inventory is needed.
Different information about scale
数十点の作品を並べました。 reports arranging several tens of works. 多数の作品を並べました。 focuses on the assessment that many works were arranged.
Both expressions may fit the same exhibition. Distinguish scale from an assessment of quantity without declaring every count of several tens large.
Does 数十人の参加者 establish exactly thirty participants?
Show the answer and why
No. It gives a scale of several tens. The exact count requires separate information.