The pages in the book my grand-daughter likes to have me read to her
when she visits.
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computers, calculators
The numbers that go into 25 is 1,5 and 25.
The median of the numbers 25 25 50 is 25.
Not outside, and not with things I happen to have around the house, but it's easy to produce in a properly equipped laboratory.
The GCF is 25.