The bar chart above shows the marks obtained by students in a mathematics test.
How many students in all took the test?
How many students in all took the test?

A.
40 
B.
30 
C.
10 
D.
20
Correct Answer: Option A
Explanation
3 + 2 + 5 + 5 + + 5 + 10 + 4 + 3 + 1 + 2 = 40
There is an explanation video available below.