IKMC 2027 - Grades 7-8 - Self-study SET 12 - Thematic Batch 3 Question 11

The picture shows the top-left corner of a 100 × 100 table. Amr cuts out a 2 × 2 block and replaces its entries by A,B,C,D as shown. B is 78 greater than A and C is 45 greater than A. What is D?