Sooraj is three times as old as his son Arjun. After 8 years, he would be two and a half times of Arjun’s age. After another 8 years, he would be _____ times Arjun’s age.

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RRC Group D Previous Paper 3 (Held On: 19 Sep 2018 Shift 1)
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  1. 2
  2. \(2\frac{1}{2}\)
  3. 3
  4. \(2\frac{1}{5}\)

Answer (Detailed Solution Below)

Option 4 : \(2\frac{1}{5}\)
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Detailed Solution

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Let the age of Sooraj be x years and of Arjun be y years.

⇒ x = 3y       ----(1)

After 8 years,

⇒ x + 8 = (5/2) (y + 8)      

⇒ 2x + 16 = 5y + 40 

putting the value of x from eq (1)  

⇒ 2 × 3y + 16 = 5y + 40   

⇒ 6y + 16 = 5y + 40

⇒ y = 24      ----(2)

Solving Equation (1) and (2), we get:

⇒ x = 72 and y = 24

 After another 8 years, the age of Sooraj = (72 + 8 + 8) = 88 years

The age of Arjun = (24 + 8 + 8) = 40 years

As per question,

Suraj age / Arjun age = 88/40

⇒ 2 × 8/40

⇒ \(2\frac{1}{5}\)

∴ After another 8 years, Sooraj would be \(2\frac{1}{5}\) times Arjun’s age.

Confusion Points Here in question it is given after 8 years ,that means first from current age we need to add 8 years and after that 8 years from then is added, so total 16 years. 

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