Jerry had some action figures on a shelf in his room. Later he added 7 more action figures to the shelf. If there are a total of 10 action figures on his shelf now how many action figures did he have initially on the shelf?
Jerry has some action figures on his shelf. 

That means that there is at least one action figure on the shelf. 

Later he added 7 more action figures to the shelf. 

That means that there are at least 8 action figures on the shelf now. 

But we know that there are 10 action figures on the shelf now, so we can say that there are at least 10 action figures on the shelf. 

That means that Jerry had at least 10 action figures on his shelf initially.