There are a number of saplings in the nursery, and 180 more saplings are sold (2/3), and 2900 saplings are transported in, which is 10% less than the original, so how many saplings are there originally?
苗圃原有树苗若干，卖出(2/3)多180棵，又运进2900棵后比原来少10%，则原来有树苗多少棵．
<gadget id="calculator">2_900 - 180</gadget>
<output>2_720</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - 1 - (1/10)</gadget>
<output>-1/10 = around -0.1</output>

<gadget id="calculator">(2/3) + (-1/10)</gadget>
<output>17/30 = around 0.566667</output>

<gadget id="calculator">2_720 / (17/30)</gadget>
<output>4_800</output>

<result>4_800</result>