16 children are playing hide-and-seek in the park, 6 of them have been caught, how many people are hiding?
16个小朋友在公园里玩捉迷藏，已经捉住了6个，藏着的还有多少人．
<gadget id="calculator">16 - 1 - 6</gadget>
<output>9</output>

<result>9</result>