 
<translate> Idan Rehana a halin yanzu tana da shekaru 25, za ta kasance 25 + 5 = 30 a cikin shekaru biyar. Rehana za ta ninka Phoebe sau uku a cikin shekaru biyar, ma'ana Phoebe za ta kasance 30 / 3 = shekaru 10 a cikin shekaru biyar. A halin yanzu, Phoebe yana da shekaru 10 - 5 = 5. 3 / 5 na shekarun Phoebe yanzu shine 3 / 5 * 5 = shekaru 3, wanda shine shekarun Yakubu. Saboda haka, amsar ita ce 3. <eng> If Rehana is currently 25 years old, she will be 25 + 5 = 30 in five years. Rehana will be three times as old as Phoebe in five years, meaning Phoebe will be 30 / 3 = 10 years old in five years. Currently, Phoebe is 10 - 5 = 5 years old. 3 / 5 of Phoebe's age now is 3 / 5 * 5 = 3 years, which is Jacob's age.
Therefore, the answer is 3. 