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To solve this problem, we first need to find the total number of people who visited the museum during the noon hour.
Let x be the total number of people who visited the museum during the noon hour.
We know that 63 adults represent 87.5% of the total number of people who visited the museum. This can be written as:
63 = 0.875x
Now, we need to solve for x:
63 = 0.875x
x = 63 / 0.875
x = 72
Therefore, the total number of people who visited the museum during the noon hour is 72.
So, the answer is:
a. 72