Final answer:
To find out how many 40-gram pens make one kilogram, divide 1000 grams (the weight of one kilogram) by the weight of one pen (40 grams), resulting in 25 pens.
Step-by-step explanation:
If one pen weighs 40 grams, and we want to find out how many pens would make one kilogram, we would start by understanding the relationship between grams and kilograms. Since 1 kilogram is equal to 1000 grams, we can divide 1000 grams by the weight of one pen to find out how many pens would make up one kilogram.
We perform the calculation as follows:
- Determine the total weight in grams that we are aiming for which is 1000 grams for one kilogram.
- Divide this total weight by the weight of one pen, which is 40 grams.
- The calculation will be 1000 grams ÷ 40 grams per pen.
- This equals 25 pens.
Therefore, it requires 25 pens to weigh one kilogram.