a survey showed that 30% of student bring their lunch to school. The survey polled 300 students do not bring their lunch to school

Answer 1

Please proofread and repost.

Answer 2

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Answer 3

30% of students bring lunch. Total students are 300.
So, 30% of 300 student is 90. (300 x 30/100 = 90 )

So 90 out of 300 bring lunch. That means students who do not bring lunch are 300 - 90 = 210.
Answer is 210 students do not being their lunch.

OR

30% of students bring lunch. So 70% of 300 students do not bring lunch.

So, 300 x 70/100 =210.
Answer = 210 students do not bring lunch