He has almost finished. He only needs ________ ten minutes.
I think "other" for the blank. But the answer key says: It will be "another". And I think another should be used before a singular noun.
What is the right answer?
He has almost finished. He only needs ________ ten minutes.
I think "other" for the blank. But the answer key says: It will be "another". And I think another should be used before a singular noun.
What is the right answer?
In your sentence, another is the correct determiner.
It marks not the plural noun minutes but the noun phrase "ten minutes" which, in the context of the sentence, is treated as a single entity.
He has almost finished. He only needs another ten minutes.
It may be convenient to think of the usage as an ellipsis of period of:
He has almost finished. He only needs another [period of] ten minutes.
An insightful answer to a similar question is provided here by StoneyB at our sister site ELU.