SSC JE Mechanical Engineering 27-Oct-2020 Shift 2 Papers

From numbers 1 to 150, we have:
Numbers having unit digit as 6 = 15 times
(06, 16, 26, 36, 46, 56, 66, 76, 86, 96, 106, 116, 126, 136, 146)
Numbers having unit tens digit as 6 = 10 times
(60, 61, 62, 63, 64, 65, 66, 67, 68, 69)
Total number of times, we write 6 = 15 + 10 = 25 times
Hence, 25 is correct.