1 packs of dvds can be bought with 47 dollars. How much does each pack cost?
1. We know that 1 pack costs 47 dollars. 
2. We also know that we can buy more than 1 pack. 
3. Therefore, each pack must cost less than 47 dollars. 

We can use this information to set up an equation: 

x + x = 47 

We know that x is the cost of 1 pack, and that we can buy 2 packs in total. Therefore, we can solve for x: 

2x = 47 
x = 23.5 

Each pack costs $23.50.