Question
In a row of trees, one tree is fifth from either end of
the row. How many trees are there in the row?Solution
Total number of trees in the row are:
5 + 5 - 1 = 9
90     211     67     236     ?     265
...62 123 214 341 ? 727
...12 3 15 ? 153 756
...9999 6666 ? 2962.66 1975.11 1316. 74
...5 11 32 65 ? 389
...123   125   129   132   ?   145
16 18 14 20 12 ?
...28         57           172           689          ?              20677
...41 48 89 137 226 ?
...171, 173, 183, 213 , ‘?’, 411, 633.