A batch of bricks needs to be shipped to the construction site, and (2/5) of these bricks have already been shipped, there are still 30,000 bricks left. How many bricks are there in total?
工地要运来一批砖，已运来这批砖的(2/5)，还剩3万块．这批砖共有多少块？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">3 / (3/5)</gadget>
<output>5</output>

<result>5</result>