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

### Instruction:
A teacher asked Adelaide, Ephraim, and Kolton to buy ducks and monitor their growth patterns and features for their science class. Adelaide bought twice the number of ducks that Ephraim bought, while Ephraim bought 45 fewer ducks than Kolton. If Adelaide bought 30 ducks, what's the average number of ducks the three bought?

### Response:
 Ikiwa Adelaide alinunua bata 30, Ephraim alinunua 30/2 = 15 bata.
Kwa kuwa Ephraim alinunua bata 45 chini ya Kolton, Kolton alinunua bata 45 + 15 = <<45+15=60>>60.
Watatu walinunua jumla ya 60 + 15 + 30 = <<60+15+30=105>>105 bata.
Wastani wa idadi ya bata kila mmoja aliyonunua ni 105 / 3 = <<105/3=35>>35 bata.