Use effective reasoning to determine the composite number described.

I am a. Complete number. I am greater than 16 but less than 20 . Two of my tractors are a number and the number doubles. I am the number

The composite number described is 18.

To determine this, we consider the given clues:
1. The number is greater than 16 but less than 20.
This narrows down the options to 17, 18, and 19.

2. Two of my tractors are a number and the number doubles.
This clue is a bit ambiguous, but it suggests that the number has two factors: one number and its double. The only number that satisfies this condition is 9, which has factors 1, 3, and 9. The double of 9 is 18.

Hence, 18 fits all the given conditions and is therefore the composite number described.