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=<<10-3=7>>7 trumpets.
Two more guitars than he has hands is 2+2=<<2+2=4>>4 guitars.
Two more trombones than he has heads is 2+1=<<2+1=3>>3 trombones.
And one fewer French horn than he has guitars is 4-1=<<4-1=3>>3 French horns.
Altogether, Miles owns 7+4+3+3=<<7+4+3+3=17>>17 musical instruments.
#### 17