Students from class 6 and 1 went out for a spring outing and bought 58 tickets for a total of 160 yuan, including 2 yuan for one-way tickets and 4 yuan for round-trip tickets. How much is the difference between a one-way ticket and a round-trip ticket?
六1班同学外出春游，买车票58张，共花160元，其中单程每张2元，往返每张4元，单程票与往返票相差多少张．
<gadget id="calculator">58 * 4</gadget>
<output>232</output>

<gadget id="calculator">232 - 160</gadget>
<output>72</output>

<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">72 / 2</gadget>
<output>36</output>

<gadget id="calculator">58 - 36</gadget>
<output>22</output>

<gadget id="calculator">36 - 22</gadget>
<output>14</output>

<result>14</result>