Answer:
Additional bags required = 4
Explanation:
Marianne buys number of bags of potting soil = 16
Each bag weighs =
pounds
Total weight of 16 soil bags =
pounds
If Marianne's father requires potting soil = 15 pounds
Amount of additional soil he will require = 15 - 12
= 3 pounds
Therefore, number of additional soil bags required =

=

=

= 4 bags
Additional bags required by Marianne= 4