The school cafeteria bought two piles of coal, the second pile was 25.5 tons, and the second pile was 1.5 tons less than twice the first pile. What is the total weight of the two piles of coal?
学校食堂买来两堆煤，第二堆25.5吨，第二堆比第一堆的2倍少1.5吨．两堆煤一共重多少吨．
<gadget id="calculator">25.5 + 1.5</gadget>
<output>27</output>

<gadget id="calculator">27 / 2</gadget>
<output>27/2 = around 13.5</output>

<gadget id="calculator">(27/2) + 25.5</gadget>
<output>39</output>

<result>39</result>