You are adding 3 each time.
81, 84, 87, 90, 93, 96, 99
87
86.90909090 recurring or 86 and one eleventh.
84, 87, 90, 93, 96, 99
765
80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100
Nine: 78, 81, 84, 87, 90, 93, 96, 99, 102.
(100+65+93+84+90+96) ÷ 6 = 88 is the average
80, 81, 82, 84, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100.
around 93 percent.
84, 87, 90, 93, 96, 99, 102, 105, 108.
Here they are ! 84. 85. 86. 87. 88. 89. 90. 91. 92. 93. 94. 95. 96. And 97 !