Let Baichung’s father’s age be x years. Therefore, Baichung’s age and Baichung’s grandfather’s age will be (x − 29) years and (x + 26) years respectively.
According to the given question, the sum of the ages of these 3 people is 135 years.
∴ x + x − 29 + x + 26 = 135
3x − 3 = 135
On transposing 3 to R.H.S, we obtain
3x = 135 + 3
3x = 138
On dividing both sides by 3, we obtain
3x/3 = 138/3
x = 46
Baichung’s father’s age = x years = 46 years
Baichung’s age = (x − 29) years = (46 − 29) years = 17 years
Baichung’s grandfather’s age = (x + 26) years = (46 + 26) years = 72 years