20.Which one of the following sentences has a number error?

25 people registered for the event.
Sara lost her Social Security number, but she thinks it's 458-71-4782.
Our vacation lasted 10 days and 9 nights.
We received over 10,000 applications

my answer

Sara lost her Social Security number, but she thinks it's 458-71-4782

I disagree.

http://grammar.ccc.commnet.edu/grammar/numbers.htm

25 people registered for the event.

Correct. You don't start a sentence with a numeral; the number needs to be spelled out at the beginning of a sentence.

To identify the sentence with a number error, we need to look for any inconsistencies in the numerical information provided. Let's analyze each sentence:

1. "25 people registered for the event."
This sentence appears to have accurate numerical information. There are no indications of a number error here.

2. "Sara lost her Social Security number, but she thinks it's 458-71-4782."
This sentence does not contain any obvious number errors. However, it's worth mentioning that a Social Security number typically consists of nine digits separated by hyphens (XXX-XX-XXXX). While there is a possibility of an error, it might not be considered a clear-cut number error.

3. "Our vacation lasted 10 days and 9 nights."
This sentence does not contain any number errors. The numerical information provided seems consistent and accurate.

4. "We received over 10,000 applications."
This sentence also seems fine, with no apparent number errors. The use of "over" implies that the number of applications is more significant than 10,000.

In conclusion, there are no clear number errors in any of the provided sentences. However, if we were to consider the potential discrepancy in the format of Sara's Social Security number, that sentence could be seen as having a number error.