Question

SOMEONE HELP!!!!!!!!!!!!!!!!!!!! I would give more points but there are people who just write random things for an answers that isnt correct just to get points.

Answer 1

a) 320 is correct

b) 20 more 18 year old students

Explanation:

a) 320 is correct

b) 20 more 18 year old students: The only information we have in the 25 - 35 minute time frame is the data for 30 minutes:

12 years: 40 students

18 years: 60 students

Difference = 20 more 18 year old students than 12 year old students spent spent time on social media for 25 - 35 seconds.