IKMC 2027 - Grades 9-10 - Self-study SET 4 - Thematic Batch 3 Question 8

Jenny fills a 3×3 grid with numbers and computes its row and column sums. An ink spill hides much of the work. The diagram preserves two row sums and two column sums. Let A be the third-column sum and B the third-row sum. Find A−B.