There is a test of 100 questions, 9 points are awarded for each correct answer, and 5 points are deducted for each incorrect answer. Unanswered questions do not count. If a student gets 0 points in the end, how many questions did he answer in total? How many
有一个100个问题的考试，答对一个得9分，答错一个扣5分．没有回答的问题不算分．若有一学生最后得了0分，请问他总共回答了多少道题？多少
<result>98</result>