Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
Trevor and Joe were working together to finish a 500 piece puzzle.  They put the border together first and that was 75 pieces.  Trevor was able to place 105 pieces of the puzzle.  Joe was able to place three times the number of puzzle pieces as Trevor.  How many puzzle pieces are missing?

### Response:
 Puzzle ina vipande 500 na mpaka ulitumia vipande 75, hivyo kuna vipande 500-75 = <<500-75=425>>425 vilivyobaki.
Trevor aliweka vipande 105 na Joe aliweka vipande mara tatu ya Trevor, hivyo Joe aliweka vipande 3*105 = 315.
Pamoja, Joe na Trevor waliweka vipande 105+315 = <<105+315=420>>420 jumla.
Baada ya kuweka mpaka, vilibaki vipande 425 na waliweka vipande 420, hivyo vipande 425-420 = <<425-420=5>>5 vilipotea.