Please read following two sentence.
- There will be around 20 reports.
- There is around 20 reports.
What is the correct / most suitable one?
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It depends whether the reports have been written or delivered. If this hasn't yet happened, the first is correct.
The second is wrong either way, since you have a singular "is" with a plural "reports". If reports have already been written, "there are around 20 reports" would be correct - but if so, can you be more accurate than "around 20"? Eighteen? Twenty one?
Do reports already exist? If so, the present tense is more accurate than the future tense. This is no different in technical writing to any other kind.