Final answer:
Mang Ben needs an additional 15.79 meters of cloth to complete the bag, which is calculated by subtracting the amount he has (89.96 meters) from the total required (105.75 meters).
Step-by-step explanation:
To solve the problem of how many more meters of cloth Mang Ben needs to complete the bag for his son, you subtract the amount of cloth he already has from the total amount needed.
The total amount of cloth required for the bag is 105.75 meters, and Mang Ben has only 89.96 meters.
To find out how much more is needed, you would calculate:
105.75 meters (total needed) - 89.96 meters (already has)
= 15.79 meters (needed additionally).
Therefore, Mang Ben will need an additional 15.79 meters of cloth to complete the bag.