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

### Instruction:
 Elizabeth ana chupa 10 za maji zinazoweza kutumika tena. Anapoteza chupa 2 shuleni. Kisha mtu mmoja anamwibia chupa 1 kwenye mazoezi ya kucheza. Ili kuepuka wizi wa baadaye wa chupa zake za maji, Elizabeth anaweka stika 3 kwenye kila chupa iliyobaki. Anatumia stika ngapi jumla kwenye chupa zake za maji?


### Response:
 Elizabeth ana chupa 10 za maji.
Anapoteza chupa 2 shuleni.
Kisha anapoteza chupa 1 zaidi kwenye mazoezi ya kucheza.
Sasa ana chupa 10 - 2 - 1 = <<10-2-1=7>>7 za maji.
Anaweka stika 3 kwenye kila chupa 7 za maji.
Hivyo anatumia stika 3 * 7 = <<3*7=21>>21.