Sami finds 3 spiders in the playground.  Hunter sees 12 ants climbing the wall.  Ming discovers 8 ladybugs in the sandbox, and watches 2 of them fly away. How many insects are remaining in the playground?
The children find 3 + 12 + 8 = 
<gadget id="calculator">3+12+8</gadget>
<output>23</output>
23 insects.
After the ladybugs fly away, there are 23 - 2 = 
<gadget id="calculator">23-2</gadget>
<output>21</output>
21 insects.

<result>21</result>