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

### Instruction:
 Kula mpaka watakapojaa, Michaela anahitaji machungwa 20. Cassandra anahitaji mara mbili ya machungwa ya Michaela ili kula mpaka ajae. Ikiwa wamechuma machungwa 90 kutoka shambani leo, machungwa mangapi yatabaki baada ya wote kula mpaka wajae?


### Response:
 Kwa kuwa Michaela anahitaji machungwa 20 ili kula mpaka ajae na Cassandra anahitaji mara mbili ya Michaela ili kula mpaka ajae, Cassandra anahitaji machungwa 2*20 = <<20*2=40>>40 ili kula mpaka ajae.
Wote wanakula 20+40 = <<20+40=60>>60 machungwa ili kujaza tumbo.
Ikiwa wamechuma machungwa 90 leo, baada ya kula 60 pamoja, machungwa yaliyobaki ni 90-60 = <<90-60=30>>30.