Answer:
20 students
Step-by-step explanation:
No. of people are 36
No. Of people in one grp are 9
No.of people formed : 36/9
=4
No.of people wearing digital watch in grp 1 =4
Total no. Of people wearing digital watch =4x4
Which is 16
Then, the number of people who do not wear digital watches are 36-16=20
Hence, 20 people do not wear digital watches in classroom of 36 students
