If a sequence is a decreasing by 1 and the first number is 20, what is the tenth number in the sequence?
If a sequence is decreasing by 1 and the first number is 20, the tenth number in the sequence would be 20 - (10-1) = 11.
Complete the following task based on the instruction and optional input provided.### Instruction:
If a sequence is a decreasing by 1 and the first number is 20, what is the tenth number in the sequence?

### Output:
If a sequence is decreasing by 1 and the first number is 20, the tenth number in the sequence would be 20 - (10-1) = 11.