conversations.from: human
conversations.value: Duke was at a garage sale when he spotted DVDs on sale.  They were separated by price into 2 different boxes.  In the first box, he found 10 movies that he wanted.  These were $2.00 apiece.  The second box was marked $5 each and he found 5 movies he wanted.  What was the average price of each of the DVDs he bought?
  How to solve this?
conversations.from: assistant
conversations.value: In the first box he bought 10 DVDs at $2.00 each, so he paid 10*2 = $20.00
  In the second box he bought 5 DVDs at $5.00 each, so he paid 5*5 = $25.00
  He bought 10+5 = 15 DVDs
  He spent $20 + $25 = $45.00
  The average price of each DVD is $45/15 = $3.00 each