AMO 2027 Grades 4-5 SET 20 - Self-study Question 1

Some numbers are arranged in a certain pattern as shown below.

What is the sum of the row of five numbers where the number 50 appears?

| Row | A | B | C | D | E |
|---|---|---|---|---|---|
| 1 | 2 | 4 | 6 | 8 | 10 |
| 2 | 20 | 18 | 16 | 14 | 12 |
| 3 | 22 | 24 | … | … | … |
| … | … | … | … | … | … |

Continue the simple rule: consecutive positive even numbers, five entries per row, alternating left-to-right and right-to-left.