In the sixth grade oral arithmetic competition, Xiao Ming completed 80 questions and completed all the questions (4/5). How many oral arithmetic questions are there in this competition?
六年级口算比赛，小明完成了80道题目，完成了全部题目的(4/5)，这次比赛共有多少道口算题？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">80 / (4/5)</gadget>
<output>100</output>

<result>100</result>