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

### Instruction:
Reagan's school has a fish tank with a total of 280 fish of two types, koi fish and goldfish. Over the next 3 weeks, the school added 2 koi fish and 5 goldfish per day. If the tank had 200 goldfish at the end of the three weeks, what's the total number of koi fish in the tank after the three weeks?

### Response:
 Idadi jumla ya siku katika wiki tatu ni 3*7=<<3*7=21>>21 siku.
Ikiwa samaki 2 koi waliongezwa kwa siku 21, idadi jumla ya samaki koi katika tangi ni 21*2=<<21*2=42>>42 baada ya wiki tatu.
Vivyo hivyo, ikiwa samaki 5 wa dhahabu waliongezwa kwa siku 21, idadi jumla ya samaki wa dhahabu katika tangi ni 21*5=<<21*5=105>>105 baada ya wiki tatu.
Idadi jumla ya samaki katika tangi ni 280+42+105=<<280+42+105=427>>427
Ikiwa kulikuwa na samaki 200 wa dhahabu katika tangi, idadi ya samaki koi katika tangi ni 427-200=<<427-200=227>>227