1.

The ratio of present ages of two friends Leo and David is 4 : 3. After 5 years the ratio of their ages become 9 : 7. What is the difference between their ages?1. 5 years2. 15 years3. 20 years4. 10 years5. 25 years

Answer» Correct Answer - Option 4 : 10 years

Given:

Age of Leo : Age of David = 4 : 3

Age of Leo after 5 years : Age of David after 5 years = 9 : 7

Calculation:

Let us assume,

Present age of Leo = 4x

Present age of David = 3x

Difference in their ages = 4x – 3x = x

ATQ,

(4x + 5)/(3x + 5) = 9/7

⇒ 28x + 35 = 27x + 45

⇒ x = 10

∴ Difference in their ages is 10 years.


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