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

### Instruction:
Lard decides to share a pizza with his friend Jelly.  He takes a whole, uncut pepperoni pizza and cuts it in half.  He then cuts these halves in half and gives one of the slices to Jelly.  Assuming the pizza started with 40 evenly spread slices of pepperoni, how many slices of it are on the slice Lard gives Jelly if 1 of them falls off the slice when Lard picks it up?

### Response:
A pizza cut in half has 1/2 the original amount of slices, for a total of 40/2= <<40/2=20>>20 slices.
A pizza cut in half again has 1/2 the amount of the first halving, for a total of 20/2=10 slices.
Since 1 slice fell off Jelly's slice, there are 10-1=<<10-1=9>>9 slices left on it.
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