Discussion

Explanation:

Let Barun’s age be 10x. Arun’s age is 4x.

The difference of these ages in 6x, a constant. 

When Arun’s age is 50% of Barun’s age, this difference also would be 50% i.e., Barun’s age, at that stage would be 12x.

It would be increase by 20%.

Alternately,
Let Barun’s age be 10x. Arun’s age is 4x.

In t years, Arun's age will be 50% or half of Barun's age

⇒ (4x + t) = 1/2 × (10x + t)
⇒ t = 2x

∴ Barun's age will become 12x.

⇒ Required % = (12x - 10x)/10x × 100% = 20%

Hence, 20.

» Your doubt will be displayed only after approval.


Doubts


shreya said (2022-10-14 15:46:59)

i still didn't understand

Reply from Admin:

Alternate explanation added, kindly check the solution.


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