JAMB 2011 · UTME · Q42

The bar chart shows the distribution of SS2 students in a school. Find the total number of students.

Scale: each grid step on the vertical axis is 15 students.

Worked solution (try it first)

Each grid step on the vertical axis is 15 students, so read the bars: I is 45, II is 60, III is 30 and IV is 45.
Add them: $45 + 60 + 30 + 45 = 180$ students, option A.