Problem

Source: Level 2 : 8th and 9th Grades

Tags: algebra



Camila creates a pattern to write the following numbers: $2, 4$ $5, 7, 9, 11$ $12, 14, 16, 18, 20, 22$ $23, 25, 27, 29, 31, 33, 35, 37$ $…$ Following the same pattern, what is the sum of the numbers in the tenth row?