Read the following pictograph.

How many students like purple colour?

Read the following chart:

How many students like vanilla flavor?

Observe the following bar graph:

Difference between the number of students who like colour purple and green.

How many student like red colour?

In a Mathematics test, the following marks were obtained by 40 students. Arrange these marks in a table using tally marks.

(a) Find how many students obtained marks equal to or more than7.

(b) How many students obtained marks below 4?

A survey of class 2 students revealed that 12 students liked reading happy stories. 14 students liked reading sad stories. 5 students like reading both sad and happy stories. How many students participated in the survey?