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Rohit is 16 years old and Aadi is 20 years old. How many years ago the ratio of their ages was 3 ∶ 4?
1. 4 years
2. 5 years
3. 6 years
4. 3 years
5. 7 years

1 Answer

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Best answer
Correct Answer - Option 1 : 4 years

Given:

Rohit’s age = 16 years

Aadi’s age = 20 years

Concept Used:

Ratio concept used.

Calculation:

Let ‘x’ years ago the ratio of their ages was 3 ∶ 4.

According To the Question,

{(16 – x)/(20 – x)} = 3/4

⇒  4(16 – x) = 3(20 – x)

⇒ 64 – 4x = 60 – 3x

⇒ 4x – 3x = 64 – 60

⇒ x = 4

∴ 4 years ago ratio of their ages was 3 4.

Always try to approach these kinds of problems by taking a look at the options. 

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