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

[Q]: Armaments manufacturers use lithium to produce tritium in _ ways.
[A]: two


[Q]: Most children overcome bed wetting between the ages of _ and ten.
[A]: six


[Q]: Iron deficiency is uncommon in breastfed babies during the first _ months of life.
[A]:
six