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

### Instruction:
Erika and her 3 siblings are drawing with chalk outside. Another 3 friends join them and ask if they can help with the drawing. Erika loses 2 pieces of chalk as they are counting and the group realizes there isn't enough chalk for everyone. Erika’s mom brings out another 12 pieces of chalk for them to share and there is now enough chalk for everyone to have 3 pieces each. How many pieces of chalk did Erika and her siblings originally have?

### Response:
 Jumla, kuna 1 Erika + ndugu 3 + marafiki 3 = <<1+3+3=7>>7 watu wanaochora nje.
Kikundi kina jumla ya watu 7 * vipande 3 vya kijipamba kila mmoja = <<7*3=21>>21 vipande vya kijipamba kwa ujumla.
Kabla mama wa Erika hajasaidia, walikuwa na jumla ya vipande 21 vya kijipamba - vipande 12 vya kijipamba alivyobeba mama wa Erika = <<21-12=9>>9 vipande vya kijipamba.
Kisha kuongeza kijipamba ambacho Erika alikipoteza inaonyesha kuwa kikundi awali kilikuwa na vipande 9 vya kijipamba + vipande 2 vilivyopotea vya kijipamba = <<9+2=11>>11 vipande vya kijipamba.