Some students in the fourth grade went rowing. They calculated that if one more boat was added, each boat would have 7 people, and if each boat had 9 people, there would be 3 empty boats. How many students went rowing in total?
四年级一些同学去划船，他们算了一下，如果增加一条船，正好每条船坐7人，如果每条船坐9人，则有3条空船．共有多少名同学去划船．
<gadget id="calculator">3 * 9</gadget>
<output>27</output>

<gadget id="calculator">7 + 27</gadget>
<output>34</output>

<gadget id="calculator">9 - 7</gadget>
<output>2</output>

<gadget id="calculator">34 / 2</gadget>
<output>17</output>

<gadget id="calculator">17 + 1</gadget>
<output>18</output>

<gadget id="calculator">7 * 18</gadget>
<output>126</output>

<result>126</result>