There is some coal in the warehouse, and its (2/5) is shipped out first, and then 28 tons are shipped in, and the current coal is 2 tons less than before. How many tons of coal is there in the warehouse?
仓库里有一些煤，先运出它的(2/5)，后又运进28吨，现在的煤比原来还少2吨．仓库原有煤多少吨？
<gadget id="calculator">28 + 2</gadget>
<output>30</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 / (2/5)</gadget>
<output>75</output>

<result>75</result>