<prompt> Bheka isigaba esingezansi bese uphendula umbuzo olandelayo ngolimi olufanayo nesigaba: Isigaba: Ukwehlukaniswa ngokweminyaka kwaba ngu-31.40 ongaphansi kweminyaka engu-18, 9.00 kusuka ku-18 kuya ku-24, 26.50 kusuka ku-25 kuya ku-44, 20.60 kusuka ku-45 kuya ku-64, no-12.40 owayeneminyaka engama-65 ubudala noma ngaphezulu. Isilinganiso seminyaka yobudala sasingu-33 iminyaka. Kwabesifazane abayikhulu kwakukhona abesilisa abangama-95.20. Kwabesifazane abayikhulu abaneminyaka engu-18 nangaphezulu, kwakukhona abesilisa abangama-91.40. Umbuzo: Iyini iphesenti labantu abangaphansi kweminyaka engu-18?  <response>: 31.4 izinga 