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

### Instruction:
A camping site recorded a total of 150 campers for the past three weeks. Two weeks ago, there were 40 campers which was 10 more than the number of campers three weeks ago. How many campers were there last week?

### Response:
 Ikiwa kulikuwa na wapiga kambi 40 wiki mbili zilizopita, na wapiga kambi 10 zaidi ya hiyo wiki tatu zilizopita, kulikuwa na wapiga kambi 30 wiki tatu zilizopita.
Jumla ya wapiga kambi kwa wiki tatu zilizopita ilikuwa 150. Kwa hiyo, kulikuwa na wapiga kambi 50 wiki iliyopita, kwani 50 + 30 = 80 wapiga kambi walirekodiwa katika wiki mbili zilizopita.