In a bar chart, the scale of $1$ unit length represents $100$ students. Then $500$ students are represented by a bar of length $5$ units.

Krish scored full $100$ marks in the final mathematics examination. The range of the class is $40$. The lowest marks in the class are _____.

The bar graph shows the number of hours spent by a programmer on computers per week. Read the graph carefully and answer the following question:

The number of hours spent in the third week is _____ hours.

The bar graph shows the number of hours spent by a programmer on computers per week. Read the graph carefully and answer the following question:

The average number of hours spent on computers per week is _____ hours.

The bar graph shows the number of hours spent by a programmer on computers per week. Read the graph carefully and answer the following question:

The ratio of the number of hours spent in the first week to that of the number of hours spent in the second week is _____.