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

### Instruction:
Archie is playing with his marbles outside. He loses 60% of them into the street. Of the remaining ones, he loses half down a sewer. If he has 20 left, how many did he start with?

### Response:
 Alikuwa na 40 kabla ya kuyapoteza chini ya mtaro kwa sababu 20 x 2=<<40=40>>40
Alikuwa na 100 kwa sababu 40/.4=<<100=100>>100