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Divide 54 words by 3 minutes to obtain this unit rate, 18 words per minute.
27
130 people
3/18
Firstly, the 1st row has 21 logs, the last has 15. The difference is 6, though the number of terms is 7. (21 - 14 = 7), and 7/7 (per row) is 1. Thus, it decreases by 1 every row. So we have an addition problem:21 + 20 + 19 + 18 + 17 + 16 + 15 = 3(36) + 18 = 108 + 18 = 126.