There are 10 bicycles and tricycles with 26 wheels in total. How many bicycles are there?
自行车和三轮车共10辆，共26个轮子，其中自行车有多少辆．
<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">30 - 26</gadget>
<output>4</output>

<gadget id="calculator">3 - 2</gadget>
<output>1</output>

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

<result>4</result>