user
Buza umbuzo uze ucacise isizathu sokuba uphendule ngolu hlobo: 21
assistant
Umbuzo ngulo: UMel mncinane ngeminyaka emithathu kunoKatherine. Xa uKatherine eneminyaka engamashumi amabini anesibini ubudala, uMel uya kuba neminyaka emingaphi ubudala? Inkqubo yokuqiqa inyathelo ngenyathelo: Xa uKatherine eneminyaka engama - 2 elishumi elinambini ubudala, uya kuba neminyaka engama - 2 * 12 = engama - 24 ubudala. Ukuba uMel uneminyaka emithathu emncinci kunoKatherine, ngoko xa uKatherine eneminyaka engama-24 ubudala, uMel uya kuba neminyaka engama-24 - 3 = 21 ubudala.