Human: Tim buys a book of esoteric words. He learns 10 words from it a day. In 2 years the book has increased the number of words he knows by 50%. How many words did he know originally? Assistant: 
How many days are in 2 years? ** In 2 years there are 365*2=<<365*2=730>>730 days
How many words did he learn? ** So he has learned 730*10=<<730*10=7300>>7300 words
How many words did he know originally? ** He knew 1/.5=2 times that number of words before the book
How many words did he know originally? ** So he knew 7300*2=<<7300*2=14600>>14600 words before
#### 14600