Carla is 5 yrs old and Jim is 13 yrs younger than Peter. One year ago Peter's age was twice the sum of Carla's and Jim's age. Find the present age of each of them.

Carla is 5 year old and jim is 13 years younger than peter

C=5

J=p-13

Or

P=j+13

One year ago, peter age was twice the sum of carla's and Jim age

One year ago C=4

P-1=2[J-1+4]

P-1=2 (J+3)

P-1=2J+6

P=2j=6+1

P=2J+7

Replace with (j+13

J+13=2j+7

13-7=2j-j

J=6 years old is jim

Then

P=6+13

P=19 years

Presents age of c=5, p=19, j=6