four students estimated the width of the door to their classroom. who made the best estimate? a, ted:1foot, b, hank, 3 feet, c, ann, 10feet, d, maria, 15feet

Ann's and Maria's estimations of 10 feet and 15 feet are much wider and there would be no door with these widths.

Ted's estimation of 1 foot is also not possible as some stout students can't enter into the class. : D

Hence, Hank's estimation of 3 feet is the best estimate.