A batch of bricks needs to be transported to the construction site. The first batch of bricks (1/3) is shipped, and the second batch of bricks is 20,000. There are still 40% of this batch of bricks. How many bricks are there in total?
工地要运一批砖，第一次运来这批砖的(1/3)，第二次运来2万块，还剩这批砖的40%，这批砖的共有多少块？
<gadget id="calculator">2 * 10_000</gadget>
<output>20_000</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (1/3) - (2/5)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">20_000 / (4/15)</gadget>
<output>75_000</output>

<result>75_000</result>