97 106 121 138 157 180
...94, 563, 2813, ? 33743, 67481
12, 24, 72, 288, 1440, ?
12, 16, 25, 41, 66, ?
Find the maximum number of trees which can be planted, 25 meters apart, on the two sides of a straight road 2125 meters long
4 8 12 48 ? 432
...120 119 ? 352 2464 2455
...1001, 728, 513, 342, 217, ?
21 11.5 13 ? 45.5 116.75
...2 3.5 11.5 44 192.5 988
9 a...