There are 37 people who want to cross the river. There is only one boat, and each boat can seat 7 people. It takes 4 minutes for the boat to go from one bank to the other. If you ask how many minutes it takes, everyone can reach the other bank.
有37个人要过河，只有一条船，每条船上可坐7个人，船每从一岸到另一岸要4分钟，问至少行多少分，人人都能到达对岸．
<gadget id="calculator">37 - 7</gadget>
<output>30</output>

<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">30 / 6</gadget>
<output>5</output>

<gadget id="calculator">4 * 5 * 2</gadget>
<output>40</output>

<gadget id="calculator">4 * 1</gadget>
<output>4</output>

<gadget id="calculator">40 + 4</gadget>
<output>44</output>

<result>44</result>