Bo is learning words for the GRE.  He got 800 flashcards.  He knew 20% of the words on them.  He has 40 days to learn the rest.  How many words does he need to learn a day?
He knows 800*.2=<<800*.2=160>>160 words
So he needs to learn 800-160=<<800-160=640>>640 words
That means he needs to learn 640/40=<<640/40=16>>16 words per day
#### 16