7
13
There can be no proper answer as the father will not live to be 150 years old.
Mary is dead
Rodger is 4 years old,Roger is 4, his sister is 2, last year Roger was 3 and his sister was 1.
Mary is 4 years old. [A+]
twenty
The boy's sister would then be 34. do the math.
Sister = 5 David = 13
Zoron will be seventeen and his sister will be seven
13
There can be no proper answer as the father will not live to be 150 years old.
Let you be x years old now Let your sister be y years old now Right now: x+3 = y In 20 years you are x+20 and your sister is y+20 years old (y+20)=2x plugging in y from the first equation: [(x+3)+20]=2x x+23=2x x = 23 y = 23+3 = 26 To check, the answer if you are 23 now an your sister is 26 now in 20 years your sister will be 46 which is twice 23.
Mary is dead
Depends on the day this would be considered and when their birthdays are to get technical, but if it is the same day of the year 3 years later then she is 13.
Rodger is 4 years old,Roger is 4, his sister is 2, last year Roger was 3 and his sister was 1.
Mary is 4 years old. [A+]
Mike is 12. Mary is 4. In 4 years, Mike will be 16 and Mary will be 8. So Mike will be twice as old as she is in four years.