1 and 3
I got that by counting by three's 3,6,9,12,15,18.....
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1 and 3.
Since 3 is the biggest number that goes into both 12 and 15, you can devide both by 3. That would give you 4/5.
12 and 15 go into the denominator 60. 1 and 3 go into 12 and 15.
15/1.25 = 12 Therefore, the number that 15 is 125 percent of, is 12.
The number 5 is common to both 15 and 100.