Study the following histogram of marks in mathematics (out of 50) of students in a class and answer the following questions.

If the pass marks in maths is 31, the number of students who failed in maths is

The line graph shows the production of steel of a certain country. Study the diagram and answer the following questions.

If 1 tonne of steel costs Rs 30,000, then what was the cost (in Rs billion) of the steel production in the year 2017?

The line graph shows the production of steel of a certain country. Study the diagram and answer the following questions.

The steel production in 2012 were greater than that in 2015 by ________.

The line graph shows the production of steel of a certain country. Study the diagram and answer the following questions.

What was the difference (in million tonnes) in the steel production between the years 2011 and 2015?

The line graph shows the production of steel of a certain country. Study the diagram and answer the following questions.

In which year was the steel production lesser than that of the previous year?

The line graph shows the exports by a certain company. Study the diagram and answer the following questions.

What were the total exports (in Rs lakhs) by the company in the last four years?

The line graph shows the exports by a certain company. Study the diagram and answer the following questions.

The exports in 2014 were lesser than that in 2011 by ________.

The line graph shows the exports by a certain company. Study the diagram and answer the following questions.

What was the difference in the exports (in Rs lakhs) between the years 2012 and 2014?

The line graph shows the exports by a certain company. Study the diagram and answer the following questions.

In which year were the exports greater than that of the previous year?