Calculate Total from Average: Finding Sum of 4 Pens in 5 Bags

To solve this problem, we'll apply the concept of the average:

• Step 1: Identify the given information. The average number of pens in each bag is $4$ and there are $5$ bags.
• Step 2: Use the formula for the total sum based on the average: $\text{Total Sum} = \text{Average} \times \text{Number of Terms}$.
• Step 3: Substitute the given values into the formula: $\text{Total Sum} = 4 \times 5$.
• Step 4: Perform the multiplication: $4 \times 5 = 20$.

Therefore, the total number of pens Roni has is $20$.