Answer:
48 seashells were given to mary
Explanation:
Mike has 74 seashells, and he gave some to mary.
__ + 26 = 74
The amount of seashells given to mary is that empty spot
So, let's subtract 74 by 26 and get 48 seashells given to mary
We can double check this answer by adding 48 and 26 to get 74, the original amount of seashells that mike had.