Divide 240 tons of coal into piles A, B, and C. The coal in pile A is 12 tons less than that in pile C. The mass ratio of coal between piles B and C is 2:5. How many tons of coal is there?
将240吨煤分成甲、乙、丙三堆，甲堆煤比丙堆煤少12吨，乙、丙两堆煤的质量比为2：5．甲堆煤有多少吨？
<gadget id="calculator">240 + 12</gadget>
<output>252</output>

<gadget id="calculator">5 + 2 + 5</gadget>
<output>12</output>

<gadget id="calculator">252 / 12</gadget>
<output>21</output>

<gadget id="calculator">21 * 5</gadget>
<output>105</output>

<gadget id="calculator">105 - 12</gadget>
<output>93</output>

<result>93</result>