The whole class of 58 people went to the park to row boats. The big boat was limited to 6 people, and the small boat was limited to 4 people. A total of 12 boats were rented, and each boat was full. How many big boats were rented?
全班58人到公园划船，大船限坐6人，小船限坐4人，共租了12挑船，每条船都坐满了，大船租了多少条．
<gadget id="calculator">4 * 12</gadget>
<output>48</output>

<gadget id="calculator">58 - 48</gadget>
<output>10</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<result>5</result>