To find out how many meals the 30 pounds of dog food will last, you need to divide the total amount of dog food by the amount of food Salma feeds her dog for each meal.
Let's call the amount of dog food Salma feeds her dog for each meal "x" pounds.
So, you have:
Total dog food = 30 pounds
Dog food per meal = x pounds
To find the number of meals it will last, you can set up the following equation:
30 pounds (total dog food) ÷ x pounds (dog food per meal) = Number of meals
Now, you can simplify this expression:
Number of meals = 30 / x
So, the 30 pounds of dog food will last for 30 / x meals. This is the simplest form of the answer.