There are only 2.5 times as many footballs as basketballs in the school sports room. There are 50 footballs. How many basketballs are there in the sports room?
学校体育室里足球的只数是篮球的2.5倍，足球有50只，体育室里的篮球有多少只？
<gadget id="calculator">50 / 2.5</gadget>
<output>20</output>

<result>20</result>