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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 |
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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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