Hello there!
Factors of 15: 1, 3, 5, 15
Factors of 25, 1, 5, 25
5*5*3=75
The least common factor of 15 and 25 is 75 is the right answer.
Hope this helps!
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-Charlie
150, 155, 163, 168, 172, 177, 186, 190, 205