Irfan exited his apartment building and walked 20 blocks west. He then walked an additional 5 blocks west.

What must he do to return to his apartment building?

Select from the drop-down menus to correctly complete the statement.

Irfan must walk? blocks? to return to his apartment building.

Think of it as a triangle. 20 is the height, 5 is the side. Use the Pythagorean Theorem to find the diagonal distance. 20 squared, or 400, plus 5 squared, or 25, is 425. Now square root that. It's around 20.6. However, they might just ne asking an addition question, since you can't go through solid blocks ...