St 1 distance between r and 0 = 3 times distance between m and 0, is the same as saying (mod r)=3(mod m)
This st alone is insuff since no info about r and m is given
St 2 says 12 is halfway m and r ie 12 is the avg of m & r; (m+r)/2 = 12; (m+r)=24
Since no info about m & r is given ---INSUFF
Combining 1 & 2
It is again Insuff because you can have two situations: 1. either both r&m are positive
For instance; r=18 then m=6
2. r is positive and m is negative
For instance; r=36 then m= -12
Hence the answer is E
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