The factory shipped a batch of raw materials. It was originally planned to use 15 tons per day, which can be used for 60 days. The actual use is 12 tons per day. How many days can this batch of raw materials be used for?
工厂运来一批原料，原计划每天用15吨，可用60天，实际每天用12吨，这批原料能用多少天？
<gadget id="calculator">60 / 12</gadget>
<output>5</output>

<gadget id="calculator">15 * 5</gadget>
<output>75</output>

<result>75</result>