Thomas has 25 drawings to display. 14 of the drawings were made using colored pencils. 7 of the drawings were made using blending markers. The rest of the drawings were made with charcoal. How many are charcoal drawings?
Thomas made 14 + 7 = 
<gadget id="calculator">14+7</gadget>
<output>21</output>
21 colored pencil and blending marker drawings.
Thomas made 25 total drawings - 21 colored pencil and blending marker drawings = 
<gadget id="calculator">25-21</gadget>
<output>4</output>
4 charcoal drawings.

<result>4</result>