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?
In the first box he bought 10 DVDs at $2.00 each, so he paid 10*2 = $<T>multiply(10, 2)=20
In the second box he bought 5 DVDs at $5.00 each, so he paid 5*5 = $<T>multiply(5, 5)=25
He bought 10+5 = <T>add(10, 5)=15 DVDs
He spent $20 + $25 = $<T>add(20, 25)=45
The average price of each DVD is $45/15 = $<T>divide(45, 15)=3.0 each
