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

### Instruction:
 Bo anajifunza maneno kwa ajili ya GRE. Alipata kadi za kumbukumbu 800. Alijua 20% ya maneno kwenye kadi hizo. Ana siku 40 kujifunza yaliyobaki. Anahitaji kujifunza maneno mangapi kwa siku?


### Response:
 Anajua maneno 800*.2=<<800*.2=160>>160
Hivyo anahitaji kujifunza maneno 800-160=<<800-160=640>>640
Hii inamaanisha anahitaji kujifunza maneno 640/40=<<640/40=16>>16 kwa siku