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

[EX Q]: Trees begin to bear _ to seven years after planting the root shoot.
[EX A]: five

[EX Q]: Chicks take _ years to develop full adult plumage.
[EX A]: five

[EX Q]: Doctors say the average adult needs _ to nine hours of sleep a night.
[EX A]:
seven