A toy factory buys a batch of cloth. It turns out that it takes 0.6 meters of cloth to make a teddy bear, and 420 pieces can be made. Later, the technology was improved, and each teddy bear saved 0.1 meters of cloth. How many pieces of this batch of cloth can be made now?
玩具厂购买一批布，原来做一个玩具熊需要0.6米布，可以做420个．后来改进技术，每个玩具熊节约用布0.1米．这批布现在可以做多少个？
<gadget id="calculator">0.6 - 0.1</gadget>
<output>0.5</output>

<gadget id="calculator">420 / 0.5</gadget>
<output>840</output>

<gadget id="calculator">0.6 * 840</gadget>
<output>504</output>

<result>504</result>