Spreadsheet: 525425d1498716599-sum-of-every-20-row-in-the-last-row-sample
Sheet: Sheet1

 |  |  |  |  |  |  | NAME |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | SUM | NEED SUM LIKE THIS ONE
 |  |  |  |  |  | 1 | 160
 |  |  |  |  |  | 2 | 183
 |  |  |  |  |  | 3 | 173
 |  |  |  |  |  | 4 | 228
 |  |  |  |  |  | 5 | 162
 |  |  |  |  |  | 6 | 238
 |  |  |  |  |  | 7 | 185
 |  |  |  |  |  | 8 | 145
 |  |  |  |  |  | 9 | 191
 |  |  |  |  |  | 10 | 179
 |  |  |  |  |  | 11 | 140
 |  |  |  |  |  | 12 | 172
 |  |  |  |  |  | 13 | 220
 |  |  |  |  |  | 14 | 200
 |  |  |  |  |  | 15 | 152
 |  |  |  |  |  | 16 | 201
 |  |  |  |  |  | 17 | 194
 |  |  |  |  |  | 18 | 149
 |  |  |  |  |  | 19 | 151
 |  |  |  |  |  | 20 | 120 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3543
 |  |  |  |  |  | 1 | 159
 |  |  |  |  |  | 2 | 209
 |  |  |  |  |  | 3 | 167
 |  |  |  |  |  | 4 | 208
 |  |  |  |  |  | 5 | 151
 |  |  |  |  |  | 6 | 135
 |  |  |  |  |  | 7 | 162
 |  |  |  |  |  | 8 | 143
 |  |  |  |  |  | 9 | 167
 |  |  |  |  |  | 10 | 175
 |  |  |  |  |  | 11 | 231
 |  |  |  |  |  | 12 | 303
 |  |  |  |  |  | 13 | 229
 |  |  |  |  |  | 14 | 262
 |  |  |  |  |  | 15 | 228
 |  |  |  |  |  | 16 | 226
 |  |  |  |  |  | 17 | 253
 |  |  |  |  |  | 18 | 230
 |  |  |  |  |  | 19 | 262
 |  |  |  |  |  | 20 | 245 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4145
 |  |  |  |  |  | 1 | 227
 |  |  |  |  |  | 2 | 231
 |  |  |  |  |  | 3 | 229
 |  |  |  |  |  | 4 | 295
 |  |  |  |  |  | 5 | 224
 |  |  |  |  |  | 6 | 281
 |  |  |  |  |  | 7 | 247
 |  |  |  |  |  | 8 | 228
 |  |  |  |  |  | 9 | 257
 |  |  |  |  |  | 10 | 235
 |  |  |  |  |  | 11 | 190
 |  |  |  |  |  | 12 | 261
 |  |  |  |  |  | 13 | 218
 |  |  |  |  |  | 14 | 270
 |  |  |  |  |  | 15 | 210
 |  |  |  |  |  | 16 | 266
 |  |  |  |  |  | 17 | 227
 |  |  |  |  |  | 18 | 276
 |  |  |  |  |  | 19 | 284
 |  |  |  |  |  | 20 | 286 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4942
 |  |  |  |  |  | 1 | 272
 |  |  |  |  |  | 2 | 188
 |  |  |  |  |  | 3 | 134
 |  |  |  |  |  | 4 | 257
 |  |  |  |  |  | 5 | 179
 |  |  |  |  |  | 6 | 152
 |  |  |  |  |  | 7 | 208
 |  |  |  |  |  | 8 | 225
 |  |  |  |  |  | 9 | 227
 |  |  |  |  |  | 10 | 197
 |  |  |  |  |  | 11 | 211
 |  |  |  |  |  | 12 | 218
 |  |  |  |  |  | 13 | 233
 |  |  |  |  |  | 14 | 206
 |  |  |  |  |  | 15 | 172
 |  |  |  |  |  | 16 | 208
 |  |  |  |  |  | 17 | 229
 |  |  |  |  |  | 18 | 175
 |  |  |  |  |  | 19 | 275
 |  |  |  |  |  | 20 | 226 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4192
 |  |  |  |  |  | 1 | 265
 |  |  |  |  |  | 2 | 227
 |  |  |  |  |  | 3 | 223
 |  |  |  |  |  | 4 | 225
 |  |  |  |  |  | 5 | 233
 |  |  |  |  |  | 6 | 253
 |  |  |  |  |  | 7 | 251
 |  |  |  |  |  | 8 | 231
 |  |  |  |  |  | 9 | 277
 |  |  |  |  |  | 10 | 254
 |  |  |  |  |  | 11 | 209
 |  |  |  |  |  | 12 | 212
 |  |  |  |  |  | 13 | 237
 |  |  |  |  |  | 14 | 167
 |  |  |  |  |  | 15 | 182
 |  |  |  |  |  | 16 | 103
 |  |  |  |  |  | 17 | 105
 |  |  |  |  |  | 18 | 97
 |  |  |  |  |  | 19 | 117
 |  |  |  |  |  | 20 | 154 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4022
 |  |  |  |  |  | 1 | 119
 |  |  |  |  |  | 2 | 128
 |  |  |  |  |  | 3 | 125
 |  |  |  |  |  | 4 | 118 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 490