1. “What a mess!” exclaimed Susan, looking down at the books on the floor. “You must have three or four hundred there.” Mike turned with a thick tome in his hand. “Not quite that number, but putting them into sets is a problem,” he told her. “For all in eights I’m one book short, and the same for fives. But for sevens I’m one too many.” How many books?

267 books

192 books

239 books