It depends on the orchestra. In full big band, there are 4 or 5 depending on what arrangements you play.
In a symphonic orchestra or symphony there can be zero or as many as 8 or 10 depending on what music they are playing.
It's all based on how many trumpets any particular arrangement of music has parts for.
A typical gamelan orchestra can consist of around 20 to 30 musicians but can vary in size depending on the type of gamelan and the specific music being performed.
3 bassoon, 1 Contrabassoon
there is four modern trumpets
Orchestra
36 trumpets
Strings
The standard version uses four trumpets.
The Philippine Philharmonic Ochestra has 66 regular members.
depends on the piece
as many as you want
To the immediate left of the conductor.
it really depends on how many GOOD trumpets are in a band. I would say about 12. I t aslso depends on the size of the band.