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

[EX Q]: Sediment consists of _ visually distinct floc layers.
[EX A]: two

[EX Q]: Adolescent suicide is approximately _ times higher than the national average.
[EX A]: three

[EX Q]: Affected trees decline for one to _ years before death occurs.
[EX A]:
three