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

[EX Q]: Black adults have three to _ times greater incidence of bacteremia, compared with white adults.
[EX A]: five

[EX Q]: Monsoons coming every three to _ years can add almost a foot of water to the mountain's surface.
[EX A]: seven

[EX Q]: Tin exists in _ allotropic forms.
[EX A]:
three