Two perpendicular line segments divide a large rectangle into 4 small rectangles

Two perpendicular line segments divide a large rectangle into 4 small rectangles. The areas of 3 of these 4 small rectangles are shown. What is the area of the other small rectangle?

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #16794