 <translate> Ugbu a, m ga-abụ 4 * 4 = afọ iri na isii, ebe ọ bụ na m ji okpukpu anọ karịa afọ anọ nke Billy. N'ihi ya, iji chọpụta afọ ole m dị mgbe a mụrụ Billy, anyị ga-ewepụ afọ anọ Billy dị site n'afọ ole m dị, nke pụtara na m dị afọ iri na isii - 4 = afọ iri na abụọ. Ya mere, azịza ikpeazụ bụ 12. <hau> A halin yanzu zan kasance 4 * 4 = 16 shekara, tun da ni ne 4 sau ya fi tsufa fiye da Billy ta shekaru 4. Saboda haka, domin mu sami shekaruna a lokacin da aka haifi Billy za mu rage shekarunsa 4 daga shekaruna, ma'ana ina da shekaru 16 - 4 = 12. Saboda haka amsar karshe ita ce 12. 