Answer : 3 pairs
1/m + 4/n = 1/12
1/m = 1/12 - 4/n = (n-48)/12n
m= 12n / (n-48)
so we can say that n>48
given that n is odd and less than 60 i.e possible odd values of n are 49,51,53,55,57,59
48<n<60
when n=49
m=12*49=588
when n=51
m=12*51/3=204
when n=53
m= non integer value
when n=55
m=non integer value
when n=57
m=76
when n=59
m=non integer value
so the pairs are (49,588) , (51,204) and (57,76)