Answer:
12 years
Step-by-step explanation:
John's age = 6 + X ( since he is 6 years older than Amina)
Amina's age = X
Amina's age: Total age = John's age + Amina's age
30years = 6+X+X
30years = 6 + 2x
30years - 6 = 2x
24years = 2x
Divide both sides by 2x
X = 12years
Therefore, Amina's age is 12years
