In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Example Input: Liquids usually descend in three to five seconds, and solids in _ to twenty seconds.
Example Output: eight

Example Input: Human eye are only about _ times sharper than a jumping spider's.
Example Output: five

Example Input: Women have _ X chromosomes, whereas men have one copy.
Example Output:
two