Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
Julia had to make 6 cakes for the party. Each cake takes 12 minutes to mix and needs 9 more minutes to bake than mix. Then it takes 6 more minutes to cool and decorate than to bake. How many hours will it take to make all 6 cakes?

### Response:
It takes 12+9=<<12+9=21>>21 minutes to bake each cake.
It takes 21+6=<<21+6=27>>27 minutes to cool and decorate each cake.
Therefore, it takes a total of 12+21+27=<<12+21+27=60>>60 minutes to make one cake.
Thus, it takes 60/60=<<60/60=1>>1 hour to bake one cake.
So, it will take 1*6=<<1*6=6>>6 hours to bake all 6 cakes.
#### 6