Okay, the library is 5 blocks east of his house. Since you said he was going north and then turned right, you know that he went east for six blocks since on a compass rose east is to the right. You said he turned south and turned right again and drove one more block. that means since he is going south and turned right, he is heading back in the direction of his house. So we know that he went six blocks east, then I subtracted when he drove back west in the opossite of east, hope I helped! :D
