Processing a batch of kites, 800 kites have been processed, accounting for (1/5) of the total. How many kites are left unprocessed?
加工一批风筝，已经加工800个，占总数的(1/5)．还有多少个风筝没加工？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">800 / (1/5)</gadget>
<output>4_000</output>

<gadget id="calculator">4_000 - 800</gadget>
<output>3_200</output>

<result>3_200</result>