The number of people who subscribed to "Composition Newspaper" in Hope Primary School was 120, which was less than the number of people who subscribed to "Science and Technology Newspaper" (9/10), and the number of people who subscribed to "Science and Technology Newspaper" was more than the number of people who subscribed to "Story Club" (3/7). How many people subscribe to "Story Club"?
希望小学订阅"作文报"的人数为120人，比订阅"科技报"的人数少(9/10)，订阅"科技报"的人数比订"故事会"的人数多(3/7)．订阅"故事会"的有多少人？
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 + (3/7)</gadget>
<output>10/7 = around 1.428571</output>

<gadget id="calculator">120 / (1/10) / (10/7)</gadget>
<output>840</output>

<result>840</result>