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In a company there are 252 engineers, in which the ratio of the number of electronics engineers and computer engineers is 2 ∶ 1. The ratio of the number of electronics engineers and computer engineers becomes 1 ∶ 1 after recruitment of some more computer engineers. The average age of all the engineers is now 22 years and the average age of the computer engineers is 2 years less than the average age of electronics engineers. (A) The average age (in years) of electronics engineers is 21 (B) The average age (in years) of computer engineers is 21 (C) The average age (in years) of electronics engineers is 23 (D) The average age (in years) of electronics engineers is 25 (E) The average age (in years) of computer engineers is 23 Choose the correct answer from the options given below: 

In a company there are 252 engineers, in which the ratio of the number of electronics engineers and computer engineers is 2 ∶ 1. The ratio of the number of electronics engineers and computer engineers becomes 1 ∶ 1 after recruitment of some more computer engineers. The average age of all the engineers is now 22 years and the average age of the computer engineers is 2 years less than the average age of electronics engineers. (A) The average age (in years) of electronics engineers is 21 (B) The average age (in years) of computer engineers is 21 (C) The average age (in years) of electronics engineers is 23 (D) The average age (in years) of electronics engineers is 25 (E) The average age (in years) of computer engineers is 23 Choose the correct answer from the options given below:  Correct Answer (B) and (C) only

Let the final average age of all the electronics engineers be x years

Total number of engineers = 252

Ratio of the number of electronics engineers and computer engineers, initially = 2 ∶ 1

Hence, initial number of electronics engineers = (2/3) × 252 = 168

Also, initial number of computer engineers = (1/3) × 252 = 84

After adding some computer engineers, new ratio = 1 ∶ 1

So, the number of computer engineers added = 168 – 84 = 84

Now, total number of engineers = 2 × 168 = 336

New average of all the 336 engineers = 22 years

So, we get:

168x + = 336 × 22

⇒ x = 23

Hence, the average age of all the electronics engineers = 23 years, and

Average age of all the computer engineers = 23 – 2 = 21 years

∴ Options (B) and (C) are only correct.

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