Mark walks 20 m east, turns left and walks 15 m, then turns left again and walks 20 m. How far is he from his starting point?
Correct answer: C. 15 m
Facing east, a left turn faces north and another left turn faces west. The 20 m east and 20 m west cancel, leaving 15 m north. He is 15 m to the north of the start.
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