Mom processed a batch of toys, processed (2/5) during the day, and completed 45 overtime at night, just completed 50% of the task. How many toys are there in this batch?
妈妈加工一批玩具，白天加工了(2/5)，晚上加班完成了45个，正好完成了任务的50%，这批玩具一共有多少个？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/2) - (2/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">45 / (1/10)</gadget>
<output>450</output>

<result>450</result>