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

[Q]: Masturbation tends to peak when children are between the ages of _ and five.
[A]: three


[Q]: Tapirs have hoofed toes, with four toes on the front feet and _ toes on the hind feet.
[A]: three


[Q]: Meningococcal disease has _ main manifestations, meningitis and septicaemia.
[A]:
two