The forest farm planted 2,400 trees last year, and those that did not survive accounted for 5% of the total. How many survived.
林场去年种了2400棵树，没有成活的占总棵数的5%．成活的有多少棵．
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">2_400 * (19/20)</gadget>
<output>2_280</output>

<result>2_280</result>