The reading of Xiaoming’s home appliance meter this time is 186 kWh, and the electricity fee is 30.8 yuan, which is 0.56 yuan/kwh. What was the reading of Xiaoming’s home appliance meter last time?
小明家电表本次的读数是186千瓦时，需缴电费30.8元，电费是0.56元/千瓦时，小明家电表上次的读数是多少？
<gadget id="calculator">30.8 / 0.56</gadget>
<output>55</output>

<gadget id="calculator">186 - 55</gadget>
<output>131</output>

<result>131</result>