The series follows two interleaved patterns of subtracting 5 and then adding 2. The sequence subtracts 5 (60 - 5 = 55), adds 2 (55 + 2 = 57), subtracts 5 (57 - 5 = 52), and adds 2 (52 + 2 = 54). Continuing this pattern, the next step is to subtract 5, which gives 54 - 5 = 49.