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

### Instruction:
On a construction site, a mason has to build 6 courses of a wall, each having 10 bricks per course. He has to build 4 such walls and realized he won't be able to finish two courses of the last wall because there were not enough bricks. What's the total number of bricks that he has used?

### Response:
 Anapokamilisha ujenzi wa ukuta wa nne, idadi jumla ya matofali ambayo ameyatumia ni 4 ukuta * 6 safu/ukuta * 10 matofali/safu = <<4*6*10=240>>240 matofali.
Idadi jumla ya matofali ambayo hajatumia ni 2 safu/ukuta * 10 matofali/safu = <<2*10=20>>20 matofali.
Idadi jumla ya matofali ambayo ameyatumia ni 240 matofali - 20 matofali = <<240-20=220>>220 matofali.