A batch of parts is produced, 25% of which are completed, and 1,500 pieces are left unfinished. How many pieces are there in this batch of toys?
生产一批零件，完成了25%，还剩1500件没完成，这批玩具一共有多少件？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1_500 / (3/4)</gadget>
<output>2_000</output>

<result>2_000</result>