There are a total of 40 coins of 1 yuan and 5 cents, and there are 33 yuan. How many 5 jiao coins are there?
1元和5角的硬币一共40枚，有33元．5角的硬币有多少枚．
<gadget id="calculator">0.5 * 40</gadget>
<output>20</output>

<gadget id="calculator">33 - 20</gadget>
<output>13</output>

<gadget id="calculator">1 - 0.5</gadget>
<output>0.5</output>

<gadget id="calculator">13 / 0.5</gadget>
<output>26</output>

<gadget id="calculator">40 - 26</gadget>
<output>14</output>

<result>14</result>