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

### Instruction:
At the circus, the clown has 3 dozen balloons on a string in his hand.  3 boys and 12 girls buy a balloon each.  How many balloons is the clown still holding?

### Response:
 Kinyonga anashikilia maballoni 3 x 12 = <<3*12=36>>36.
Watoto hawa wananunua maballoni: 3 + 12 = <<3+12=15>>15 watoto.
Baada ya watoto kununua maballoni, kinyonga anashikilia maballoni haya mkononi mwake 36 - 15 = 21.