Explanation:
To find the number of marbles in each bag, we need to divide the weight of the bag by 10, since each marble weighs 10 grams.
Bags Weight of Bag (grams) Number of Marbles
1 10 1
2 20 2
3 30 3
4 40 4
... ... ...
12 120 12
Therefore, the number of marbles in each bag is equal to the weight of the bag (in grams) divided by 10.