The quarterback passed a gain of 27 yards, but the next play, the referee called a penalty of 10 yards. how far did the ball advance after the two players?

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David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?

Henry's butcher shop uses an electronic scale that measures to 1/100 of a pound. which is the most accurate measurement based on the limitations of the scale that might be found on a package of meat sold by henry?