The table shows the number of students who wear watches in three Primary 2 classes in a school.
- How many students in the three classes wear watches?
- The total number of students who wear watches is the same as the total number of students in Class 2B. How many students in Class 2A do not wear watches?
(a)
Total number of students wearing watches
= 17 + 21 + 13
= 51
(b)
Total number of students in Class 2B
= 7 + 21
= 28
Number of students wearing watches in Class 2A
= 28 - (7 + 11)
= 28 - 18
= 10
Answer(s): (a) 51; (b) 10