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

[Q]: Equations are statements which say that _ quantities are equal.
[A]: two


[Q]: Clinical psychologists differ from psychiatrists in _ important ways.
[A]: two


[Q]: Centipedes are born with as few as _ pairs of legs, gaining a new set with each molting.
[A]:
four