John is 36 years old and Jimmy is 11 years old and how many years will Johns age be twice Jimmy's age

36 + x = 2 (11 + x)

36+x=22+2x

14=x

John will be twice Jimmy's age in 14 years.

Alternate way:

Keep writing their ages for every year until John is twice Jimmy's age.

In the beginning: John is 36 years old, Jimmy is 11 years old.

As the years pass ...

After 1 years: (John, 37), (Jimmy, 12)

After 2 years: (John, 38), (Jimmy, 13)

After 3 years: (John, 39), (Jimmy, 14)

After 4 years: (John, 40), (Jimmy, 15)

After 5 years: (John, 41), (Jimmy, 16)

After 6 years: (John, 42), (Jimmy, 17)

After 7 years: (John, 43), (Jimmy, 18)

After 8 years: (John, 44), (Jimmy, 19)

After 9 years: (John, 45), (Jimmy, 20)

After 10 years: (John, 46), (Jimmy, 21)

After 11 years: (John, 47), (Jimmy, 22)

After 12 years: (John, 48), (Jimmy, 23)

After 13 years: (John, 49), (Jimmy, 24)

After 14 years: (John, 50), (Jimmy, 25)