The three factories spend the same amount of money to buy coal. As a result, Factory A takes 15 tons more coal than Factory B, and Factory C takes 15 tons more coal than Factory B. Therefore, Factory A and the two factories each pay Factory B 3,000 yuan. How much is a ton of coal.
三个工厂拿出相同的资金买煤，结果甲厂比乙厂多拿煤15吨，丙厂比乙厂多拿煤15吨，因此甲厂和两厂各付给乙厂3000元，则每吨煤多少元．
<gadget id="calculator">30 / 3</gadget>
<output>10</output>

<gadget id="calculator">15 - 10</gadget>
<output>5</output>

<gadget id="calculator">3_000 / 5</gadget>
<output>600</output>

<result>600</result>