A pool has 48 blue tiles and 32 red tiles. If the pool needs 100 tiles to be completed, how many more tiles are needed?
The pool currently has 48+32 = 
<gadget id="calculator">48+32</gadget>
<output>80</output>
80 tiles.
The pool needs 100-80 = 
<gadget id="calculator">100-80</gadget>
<output>20</output>
20 more tiles to be completed.

<result>20</result>