Baichung's father is 26 year younger than Baichung's grandfather and 29 year older than Baichung. The sum of all the three is 135 years. What is the àge of each one of them
Answers
Let the age of Baichung’s father = m year
Since, Baichung’s father is 26 year younger than Baichung’s grand father
Therefore, Age of Baichung’s grandfather = Age of Baichung’s father + 26 = m + 26 year
Since, Baichung’s father is 29 year older than Baichung
Therefore, Age of Baichung = Age of Baichung’s father – 29 = m – 29 year
Now, we have
Age of Baichung = m – 29 year
Age of Baichung’s father = m year
Age of Bahichung’s grandfather = m + 26 year
According to question, the sum of ages of all the three = 135 year
Therefore,
Age of Baichung + Age of Baichung’s father + Age of Baichung’s grandfather = 135
⇒ (m – 29) + m + (m + 26) = 135 year
⇒ m – 29 + m + m + 26 = 135 year
⇒ m + m + m – 29 + 26 = 135 year
⇒ 3m – 3 = 135 year
After transposing – 3 to the RHS, we get
3m = 135 year + 3
⇒ 3m = 138 year
After dividing both sides by 3, we get
This means age of Baichung’s father = 46 year
Now, by substituting the value of m, we can calculate the age of Baichung and the age of Baichun’s grandfather.
Therefore,
Age of Baichung = m – 29 = 46 – 29 = 17 year
Age of Baichung’s grandfather = m + 26 = 46 + 26 = 72 year
Thus,
- Age of Baichung = 17 year
- Age of Baichung’s father = 46 year
- Age of Baichung’s grandfather = 72 year
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Let Baichung's age = x years
Baichung's father age= (x+29) years
Baichung's grandfather age = x + 29 + 26 = (x + 55) years
According to the question,
x + (x + 29) + (x + 55) = 135
=> x + x + 29 + x + 55 = 135
=> 3x + 84 = 135
=> 3x = 135 - 84
=> 3x = 51
=> x = 51/3
= 17 years
Hence, Baichung's age = 17 years
Baichung's father's age = 17 + 29 = 46 years
Baichung's grandfather's Age = 46 + 26 = 72 years