In the figure given below the triangle represents pens, the rectangle represents pencils and the circle represents erasers. Number in each area represents the number of items in that area.

How many pens are pencils?

The correct answer is 21.

Based on the provided Venn diagram, each geometric shape represents a specific item:
• Triangle represents Pens
• Rectangle represents Pencils
• Circle represents Erasers

To determine the total number of pens that are pencils, we need to look at the numbers inside the area shared by both the Triangle (pens) and the Rectangle (pencils).

The overlapping region between the triangle and the rectangle contains two distinct parts:
1. Pens that are pencils (outside the circle) = 5
2. Pens that are pencils and also erasers (inside the circle) = 16

To find the total number of pens that are pencils, we add these two numbers together:

$\text{Total pens that are pencils}=16+5=21$

Thus, the total number of pens that are pencils is 21.