Miles is a musician.  He owns three fewer trumpets than he has fingers, and two more guitars than he has hands.  He also owns two more trombones than he has heads, and one fewer French horn than he has guitars.  What is the total number of musical instruments that Miles owns?
Three fewer trumpets than Miles has fingers is 10-3=
<gadget id="calculator">10-3</gadget>
<output>7</output>
7 trumpets.
Two more guitars than he has hands is 2+2=
<gadget id="calculator">2+2</gadget>
<output>4</output>
4 guitars.
Two more trombones than he has heads is 2+1=
<gadget id="calculator">2+1</gadget>
<output>3</output>
3 trombones.
And one fewer French horn than he has guitars is 4-1=
<gadget id="calculator">4-1</gadget>
<output>3</output>
3 French horns.
Altogether, Miles owns 7+4+3+3=
<gadget id="calculator">7+4+3+3</gadget>
<output>17</output>
17 musical instruments.

<result>17</result>