Answer:
11 years
Step-by-step explanation:
Let age of Jack is x. Jack's father is 3 times older than jack.
Age of Jack's father = 3x
5 years ago,
Jack's age = x-5
Father's age = 3x-5
ATQ,
5 years ago the sum of their ages was 34.
x-5+3x-5=34
4x-10=34
4x=44
x=11
So, the present age of Jack is 11 years.
Jack's present age is = 11 years.
Lets take jack's age to be = J
Jack's father is 3 times older than jack = 3 × J = 3J
But , 5 years ago the sum of their ages was 34.
That is, (J - 5) + ( 3J - 5) = 34
Open up the bracket and bring the like terms together,
4J - 10 = 34
4J = 34 +10
4J = 44
J = 44/4
J = 11
Therefore, Jack's present age is = 11 years.
Learn more about substitution equations here:
https://brainly.com/question/13729904
