my son is 7 times older than my grandson and i am 12 times older than my grandson. if you added all of our ages together the sum is 100 years. can you tell me my age in years

The equation would be x+7x+12x = 100

solving gives x=5

12*5=60

7*35

5+35+60=100

The age/answer is 60

Let us suppose my grandson age is x years.

Given my son is 7 times older my grandson so my grand son age = 7x.

My age is 12 times older my grandson age so my age = 12x

Sum of all the ages is given as 100 years

We can form an equation with this information

x+7x+12x=100

Adding all the like terms

20x=100

Dividing both sides by 20

x=5

The question is asking to find my age.

My age=12x=12 (5) = 60

My age is 60 years.