The electricity price per kilowatt-hour for residents in a certain city is 0.52 yuan. Fangfang's family paid 23.4 yuan for electricity last month. How many kilowatt-hours are they using?
某市居民用电每千瓦•时的价格是0.52元，芳芳家上个月付电费23.4元，用电多少千瓦•时？
<gadget id="calculator">23.4 / 0.52</gadget>
<output>45</output>

<result>45</result>