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