Question

Joe's age, joes sisters age and joe's father's age sums up to a century. when son is as old as his father, joe's sister will be twice as old as now. when joe is as old as his father then his father is twice as old as when his sister was as old as her father

Answer 1

joe's age=25years
sister's age=25 years
father's age= 50 years

Answer 2

Thank you for asking this question :

Here is your answer:

Joe+sister+father=100

After x years lets Joe's age is equal to his father

Joe + x = father

Therefore, sister + x = 2 * sister

=> sister = x

Joe + sister = father

Therefore, 2 * father = 100

Hence

Father = 50

If there is any confusion please leave a comment below.