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

Input: Consider Input: Reverse osmosis uses three to ten gallons of water to produce _ gallon of drinking water.

Output: one

Input: Consider Input: Most orangutans are four to _ feet long, some can reach a length of six feet.

Output: five

Input: Consider Input: Puppy teeth begin to erupt until all the baby teeth are in by about _ to six weeks of age.
Output: five