What scale has been chosen here?

Keep in mind the scale chosen here.

Find the sum of the number of hours spent by Ajay,Priya and Rohan together first and then the sum of total number of hours spent by Ria and Ankita and then find the difference.

See the scale chosen here first and make a table and then proceed.

Recall the steps to create pictographs.

Find the sum of Monday and Tuesday first and then the sum of Wednesday and Thursday and then find the difference.

Remember the scale chosen here.