To determine how many 6.5 cm cereal bars you need to cover an area of 4.0075 cm, we first need to clarify that you cannot cover an area with a length measurement alone. If your question is about covering a surface area (like a square with sides of 4.0075 cm), we would need to calculate the area.
However, if you're looking to cover a linear distance or circumference instead, you can simply divide the total length by the length of one cereal bar.
If your goal is to cover an area, you would need to specify how you are placing the cereal bars (side by side, in a grid, etc.) to calculate how many you need.
Can you clarify your question further?