A factory produces a batch of toys. After completing 80% of the task, 280 more toys are added. In this way, 20% more toys need to be made than the original ones. How many toys were originally made?
某工厂生产一批玩具，完成任务的80%后，又增加了280件，这样还需要做的玩具比原来的多20%，原来要做多少件玩具？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) + (1/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">280 / (2/5)</gadget>
<output>700</output>

<result>700</result>