The bar model that represents the problem is:
Sausage (m)
Veggie (3m)
24
In this bar model:
- "Sausage" represents the number of mushrooms on the sausage pizza, which is denoted as "m."
- "Veggie" represents the number of mushrooms on the veggie pizza, which is 3 times the number on the sausage pizza (3m).
- "24" represents the 24 mushrooms on the veggie pizza.
This bar model visually represents the relationship between the number of mushrooms on the sausage pizza (m), the number of mushrooms on the veggie pizza (3m), and the 24 mushrooms on the veggie pizza as described in the problem.