Hengjia mobile phone supermarket sold 25% of the total number of mobile phones in April, and sold 6 more mobile phones in May than in April, leaving 45% unsold. May I ask how many mobile phones are there in Hengjia Supermarket?
亨嘉手机超市4月份卖出手机总数的25%，5月份比4月份多卖出6部，还剩45%没有售出．请问亨嘉超市共有手机多少部？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (1/2) - (9/20)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">6 / (1/20)</gadget>
<output>120</output>

<result>120</result>