Study the given table and answer the question that follows.

The table shows the classification of 100 students based on the marks obtained by them in History and Geography in an examination.

Subject	Marks out of 50
	40 and above	30 and above	20 and above	10 and above	0 and above
History	9	32	80	92	100
Geography	4	21	66	81	100
Average (Aggregate)	7	27	73	87	100

Based on the table, what is the number of students scoring less than 20% marks in aggregate?

The correct answer is 13.

Let's carefully read the table and solve this step by step.

Step 1: Understand the table structure.
The data is cumulative — each column heading like "30 and above" means the number of students who scored at least that many marks. The row we care about is the Average (Aggregate) row:

| 40 and above | 30 and above | 20 and above | 10 and above | 0 and above | |:---:|:---:|:---:|:---:|:---:| | 7 | 27 | 73 | 87 | 100 |

Step 2: Convert "less than 20% marks" into a marks threshold.
The exam is out of 50 marks. So 20% of 50 is:

20\%of50=\frac{20}{100}\times 50=10

So "less than 20% marks" means scoring less than 10 marks.

Step 3: Find the number of students scoring less than 10 marks in aggregate.
From the Aggregate row:

• Students scoring 0 and above (i.e., all students) = 100
• Students scoring 10 and above = 87

Therefore, students scoring less than 10 marks = Total - (students scoring 10 and above):

100-87=13

Conclusion:
The number of students scoring less than 20% marks in aggregate is 13.