You can buy 3 basketballs for the price of a football, and it costs 138 yuan to buy a football. How much does it cost to buy a basketball?
一只足球的价钱可以买3只蓝球，买一只足球要138元，买一只蓝球要多少元？
<gadget id="calculator">138 / 3</gadget>
<output>46</output>

<result>46</result>