There are 4,500 poplar saplings in the nursery, and 800 willow saplings are 3 times less than poplar saplings. How many willow saplings are there?
苗圃场有杨树苗4500株，柳树苗比杨树苗的3倍少800株，柳树苗有多少株？
<gadget id="calculator">4_500 * 3</gadget>
<output>13_500</output>

<gadget id="calculator">13_500 - 800</gadget>
<output>12_700</output>

<result>12_700</result>