Question

4 year later my age will be twice of my cousin.4 years before i was 6 times his age. what is my age.

Answer 1

a: your age
b: your cousin's age

4 years later, my age will be twice that of my cousin's:
(1) a+4=2(b+4)

4 years before, I was 6 times his age:
(2) a-4=6(b-4)

From (1):
a+4=2b+8
(3) a=2b+4

Plugging in (3) into (2):
(2b+4)-4=6(b-4)
2b=6b-24
-4b=-24
(4) b=6

Plugging in (4) into (3):
a=2(6)+4
(5) a=16

From (4) and (5):
Your age is 16 and your cousin's age is 6.