Sonali, Rohit, and Neha, who all share the same birthday, recently celebrated their joint birthday party. This year, their ages are 72, 48, and 60 years, respectively. What was the ratio of their ages exactly 15 years ago on their common birthday?

Subtract 15 from each of their current ages to find their ages exactly 15 years ago. This gives Sonali's age as 72 minus 15 equals 57, Rohit's age as 48 minus 15 equals 33, and Neha's age as 60 minus 15 equals 45. The ratio of their ages is 57 to 33 to 45, and dividing all numbers by their greatest common divisor of 3 yields the simplified ratio 19 to 11 to 15.

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