AMO 2027 Grades 4-5 SET 21 - Self-study Question 15

Given $2\oplus3=3+4+5$ and $5\oplus4=4+5+6+7+8+9$. Find $7\oplus5$.

Use the simple intended rule: a ⊕ b is the sum of consecutive integers from b through b + a, including both endpoints.