There are 46 students in a certain school who go rowing. They rent 10 boats in total. Each big boat can accommodate 6 people, and each small boat can accommodate 4 people. The last small boat is short of 2 people. So how many big boats are there?
某校共有46名同学去划船，一共租了10条船，大船每只坐6人，小船每只坐4人，最后一条小船还差2人，那么大船有多少只？
<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">46 - 40 - 4</gadget>
<output>2</output>

<gadget id="calculator">4 + 2 + 2</gadget>
<output>8</output>

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

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<result>4</result>