Baker made 48 cakes. He sold 12 of them and bought 49 new cakes. How many more cakes did baker buy than those he sold?
Baker made 48 cakes. 
He sold 12 of them. 
That means he has 36 cakes left. 
He bought 49 new cakes. 
That means he has 85 cakes in total. 

Now we can answer the question: 

Baker bought 49 new cakes. 
He sold 12 of them. 
That means he bought 37 more cakes than those he sold.