If each person moves 18 bricks, there are 2 bricks left; if each person moves 20 bricks, there is a student who has no bricks to move, and asks how many bricks there are.
如果每人搬18块砖，还剩2块；如果每人搬20块，就有一位同学没砖可搬，问共有多少块砖．
<gadget id="calculator">20 + 2</gadget>
<output>22</output>

<gadget id="calculator">20 - 18</gadget>
<output>2</output>

<gadget id="calculator">22 / 2</gadget>
<output>11</output>

<gadget id="calculator">11 - 1</gadget>
<output>10</output>

<gadget id="calculator">20 * 10</gadget>
<output>200</output>

<result>200</result>