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

### Instruction:
Colston knows that his teacher loves drinking coffee and one day wants to see how much she drinks each week. He sees that she has a 20-ounce thermos and when she makes her coffee she pours a 1/2 cup of milk in, and then fills the coffee to the top. She does this twice a day. After the five-day school week, he decides to tell her, and when she hears how much coffee she drinks, she decides to drink 1/4 of what she normally drinks. How many ounces of coffee does she now drink a week?

### Response:
 Kwanza, Colston anahitaji kujua onsi ngapi za kahawa mwalimu wake ananywa kila siku. Kufanya hivyo, kwanza anahitaji kujua onsi ngapi za maziwa anamwaga katika chombo chake cha kuhifadhia kahawa. Kufanya hivyo, anahitaji kubadilisha kiasi cha maziwa kuwa onsi, 1/2 kikombe = 4 onsi.
Anamwaga hii katika chombo chake cha kuhifadhia kahawa chenye onsi 20, na kisha anajaza kahawa hadi juu, hivyo anakunywa onsi 20 - 4 = <<20-4=16>>16 za kahawa katika chombo hicho kila siku.
Anakunywa hii mara mbili kwa siku, hivyo anakunywa onsi 16 * 2 = <<16*2=32>>32 kwa siku.
Kuna siku tano katika wiki ya shule, hivyo anakunywa onsi 32 * 5 = <<32*5=160>>160 kwa wiki.
Colston anamwambia hii, na ananza kunywa 1/4 ya kile anachokunywa kawaida, hivyo sasa anakunywa onsi 160 / 4 = <<160/4=40>>40 kwa wiki.