Question

best answer gets medal: Kyle, Randy, and Ben each play a different instrument in a jazz trio. The trumpet player isn’t Kyle. Randy sits next to the tuba player, and Ben plays the flute. Determine which instrument each boy plays. Show your work.

Answer 1

Since you already know that Ben plays the flute ignore him and the flute as a whole.
There are now only 2 instruments left between Kyle and Randy.
The tuba and trumpet are all that remain.
Since the trumper player isn't Kyle it must be Randy.
Therefor the tuba player is Kyle.