 
<translate> Mutane 40 suna yin wasan motsa jiki kuma dukkansu suna da ƙafa 2 wanda ke nufin akwai 40 * 2 = 80 ƙafa. Kowace ƙafa tana buƙatar keken hawa kuma kowane keken hawa yana da ƙafafu 4 don haka 80 * 4 = ƙafafu 320 lokacin da kowa ya yi gudu. Amsar ƙarshe: 320. <eng> 40 people were roller skating and they all had 2 feet which means there were 40 * 2 = 80 feet. Each foot needs a roller skate and each roller skate has 4 wheels so 80 * 4 = 320 wheels when everyone skated.
The final answer: 320. 