A new book sold 15 copies at the bookstore on Wednesday. On Thursday the book sold three times that many copies. On Friday the book sold one-fifth the number of copies it did on Thursday. How many copies of the book did the bookstore sell by Friday? Let's think step by step and output the final answer after "####".
user
On Thursday 15*3=<<15*3=45>>45 books were sold.
On Friday 45/5=<<45/5=9>>9 books were sold
Adding up all three days 15+45+9=<<15+45+9=69>>69 books were sold by Friday
#### 69
A new book sold 15 copies at the bookstore on Wednesday. On Thursday the book sold three times that many copies. On Friday the book sold one-fifth the number of copies it did on Thursday. How many copies of the book did the bookstore sell by Friday?
train