There is a pile of coal in a certain factory, which has been burned for 16 days. After that, it burns 0.1 tons less every day, and the remaining 19.8 tons can be burned for 18 days. How many tons is this pile of coal?
某工厂有一堆煤，已经烧了16天，以后每天少烧0.1吨，剩下的19.8吨可以烧18天．这一堆煤共有多少吨？
<gadget id="calculator">19.8 / 18</gadget>
<output>1.1</output>

<gadget id="calculator">1.1 + 0.1</gadget>
<output>1.2</output>

<gadget id="calculator">1.2 * 16</gadget>
<output>19.2</output>

<gadget id="calculator">19.2 + 19.8</gadget>
<output>39</output>

<result>39</result>