There are 40 people in the whole class, and 8 boats are rented in total, and each boat is full. 6 people per big boat, 4 people per small boat, how many big and small boats, how many big and small boats
全班共40人，共租了8条船，每条船都坐满．每条大船6人，每条小船4人，大、小船各多少条大小船各多少条
<gadget id="calculator">4 * 8</gadget>
<output>32</output>

<gadget id="calculator">40 - 32</gadget>
<output>8</output>

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

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

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

<result>4</result>