Answer:
Zak's is 9 year old
Step-by-step explanation:
Let the age of Zak be x and his sister's age be y
Given ; zak is 6 years older than half his sister bellas age
i.e , x = 6 + y/2 ... so this is the equation in which we put the value of Bella's age to get the age of Zak !
So, when Bella is 6 years old
i.e, y = 6
x = 6 + 6/2
x = 6 + 3
x = 9
So, Zak is ( x ) 9 year old !
