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

[EX Q]: Reverse osmosis uses three to ten gallons of water to produce _ gallon of drinking water.
[EX A]: one

[EX Q]: Arthritis is the leading cause of disability in the state affecting about one in _ adults.
[EX A]: three

[EX Q]: Most children have four to _ viral upper respiratory infections each year.
[EX A]:
eight