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First name
Ashish Gupta
School
Lilavatibai Podar
Country
India
Age
11

One of the triplet that i found out is

12 , 16 , 20 !

Since the sum of A + B + C = an even number , 1 of them cant be odd , i.e. either 2 are odd and 1 even or all are even !

thus we eventually get this answer after a bit of number trying