Teacher Wang took 700 yuan to buy basketballs, bought 12, and left 40 yuan. How much does each blue ball cost?
王老师带700元去买篮球，买了12个，还剩40元．每个蓝球的价钱是多少？
<gadget id="calculator">700 - 40</gadget>
<output>660</output>

<gadget id="calculator">660 / 12</gadget>
<output>55</output>

<result>55</result>