Renee is 16. Dana is 8.
Four years ago, Renee was 12 and Dana was 4 (12 is three times 4)
The algebra is
R = 2D
R-4 = 3 (D-4)
Substitute the first value in the second:
2D - 4 = 3 (D-4)
-4 = D-12
8 = D
28
Mary is dead
Mary is 4 years old. [A+]
12,4...16,8
Jennifer is 13 years older than her cousin, Jane, and three times as old as her cousin Freddy. Jane is twice as old as her little brother, Jack. If Jack is one year old, then how old is Jennifer?
Renee is 16 and Dana is 8. Four years ago, Renee was 12 and Dana was 4 R = 2 (D) R-4 = 3(D-4) Substitute 2D for R 2D-4 = 3D-12 8 = D
Krishna is 12 and three times as old as his brother, who must be 4. In 4 years time when Krishna is 16 he will be twice as old as his brother, who will then be 8.
15.
28
Joe is 10 years older than James. In 8 years, twice Joe's age will equal three times James's age. How old is each now?
Mary is dead
Mary is 4 years old. [A+]
John will be 16.
son is 10, father is 33
12,4...16,8
Amy will be 16 when she is twice as old as Emily at 8.
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.