Subtract 2 from a number, multiply by 5, divide by 2, add 8, and the result is 18. What is this number?
一个数减去2，再乘5，然后再除以2，最后再加8，结果等于18．这个数是多少．
<gadget id="calculator">18 - 8</gadget>
<output>10</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">10 * (2/5)</gadget>
<output>4</output>

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

<result>6</result>