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I listed 10 questions in a questionnaire and sent it to 100 people. 90 of them completed the questionnaire and returned them to me.

Shall I say I have sent out 100 copies of the questionnaire or questionnaires ? I have received 90 responses, replies or feedbacks.

Thank you.
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Hi,
I listed 10 questions in a questionnaire and sent it to 100 people. 90 of them completed the questionnaire and returned it them to me.
Shall I say I have sent out 100 copies of the questionnaire or questionnaires ? I have received 90 responses, replies or feedbacks.

I have sent out 100 copies of the questionnaire.
More natural, if you want to make both staements, is to say
I sent out 100 copies of the questionnaire.

And then say -

I have received 90 responses, replies or feedbacks.
It's really thi s statement that has importance to your present situation.

Clive
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Thank you very much Clive.

I thought I have to use 'them' because each one of them return one copy of the questionnaire to me and it is a total of 90 copies.

If I sent out 100 copies online and received 90 responses and conducted 70 face to face survey, I would have 160 copies of quesetionnaire / reponses / questionnaires to compile my data base.

What do we call a completed questionnaire?
Hi,

I thought I have to use 'them' because each one of them return one copy of the questionnaire to me and it is a total of 90 copies.

If I sent out 100 copies online and received 90 responses and conducted 70 face to face survey, I would have 160 copies of quesetionnaire / reponses / questionnaires to compile my data base.
I asssume each survey resulted in a completed questionnaire. Say 'an interview', not 'a survey'.

What do we call a completed questionnaire?
a completed questionaire
a response
Not a feedback. 'Feedback' is a uncountable noun.

Clive
Thank you very much, Clive. You have always been helpful. I appreciate that.
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