A pile of bricks is moved away (1/4), and then 360 bricks are brought in. At this time, there are more bricks than before (1/5), so how many bricks are there originally?
一堆砖，搬走(1/4)后又运来360块，这时比原来多(1/5)，则原来有砖多少块．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(6/5) - (3/4)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">360 / (9/20)</gadget>
<output>800</output>

<result>800</result>