The school bought 6 electronic counters for the first time, and bought the same 5 electronic counters for the second time. I spent 168 yuan for the first time, how much did I use for the second time?
学校第一次买了6个电子计数器，第二次又买了同样的5个电子计数器．第一次用了168元，第二次用了多少元？
<gadget id="calculator">168 / 6</gadget>
<output>28</output>

<gadget id="calculator">28 * 5</gadget>
<output>140</output>

<result>140</result>