Two groups of students have a rope skipping competition, with an average of 152 jumps per minute per person. There are 9 students in group A, with an average of 160 jumps per minute per person. If the average jump of 140 times per person in group B, how many students in group B ?
两组学生进行跳绳比赛，平均每人每分钟跳152次，甲组有学生9人，平均每人每分钟跳160次，如果乙组学生平均每人跳140次，那么乙组有学生多少人？
<gadget id="calculator">160 * 9</gadget>
<output>1_440</output>

<gadget id="calculator">152 * 9</gadget>
<output>1_368</output>

<gadget id="calculator">1_440 - 1_368</gadget>
<output>72</output>

<gadget id="calculator">152 - 140</gadget>
<output>12</output>

<gadget id="calculator">72 / 12</gadget>
<output>6</output>

<result>6</result>