A toy factory produces a batch of children's toys. In the first week, 25% of this batch of toys is completed, and in the second week, 30% of this batch of toys is completed. In the second week, 450 more toys are produced than in the first week. How many toys are there in total? indivual?
玩具厂生产一批儿童玩具，第一周完成了这批玩具的25%，第二周完成这批玩具的30%，第二周比第一周多产生了450个，这批玩具一共有多少个？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(3/10) - (1/4)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">450 / (1/20)</gadget>
<output>9_000</output>

<result>9_000</result>