Out of 30 kids that came to a Halloween party 4 wore Harry Potter costumes, 3 were dressed as Ron Weasley, and 5 were dressed as Hermione Granger. What percent of all kids at the party were dressed as Hogwarts students?

Andy wants to find the distance d across a river. he located points as shown in the figure, then use similar triangles to find that d = 223.5 feet. how can you tell without calculating that he must be wrong? tell what you think he did wrong and correct his error. round your answer to the nearest tenth if necessary. andy must have used the wrong . the distance d is actually feet.