pile of coal burns an average of 3.2 tons per day, and 8.3 tons remain after 5 days. How many tons does this pile of coal have?
一堆煤，平均每天烧3.2吨，5天后还剩8.3吨，这堆煤原有多少吨？
<gadget id="calculator">3.2 * 5</gadget>
<output>16</output>

<gadget id="calculator">16 + 8.3</gadget>
<output>24.3</output>

<result>24.3</result>