The following bar graph represents the sales of different fruits from a stall in a day. Find the difference in sales between the most and the least popular fruit.
Here the horizontal axis is x-axis and it represents fruits and the vertical axis is y-axis and it represents the fruits sold in kgs. x-axis represents fruits and the scale for y-axis, 1 cm = 5 kg. 

Organising data makes it easier to read.

The bar graph below gives the strength of 'Section A' consecutively for 6 years since 2009, when it was Class 6, Section A. Each year, same students get promoted to next class. Also, some of the students get new admission and some of the students get transferred. So, the number of students varies accordingly.
Here the horizontal axis is x-axis which represents class and vertical axis is y-axis which represents number of students. The scale for x-axis is 1 cm = 1 class and y-axis 1 cm = 10 students.

How many students got admitted to the class at the start of session 2012 if nobody from the previous year batch took a transfer and 2 students were not promoted?

In the pictograph given below, the number of bikes sold in different months is shown. What is the number of bikes sold in the month, 2 months before the month which had the maximum number of bikes sold?