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If a ∶ b = 2∶ 3; b ∶ c = 4 ∶ 5 and c ∶ d = 6 ∶ 7, then a ∶ d = ?
1. 12 ∶ 35
2. 24 ∶ 35
3. 16 ∶ 35
4. 24 ∶ 25

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Correct Answer - Option 3 : 16 ∶ 35

Calculation 

a : b = 2 : 3 

b : c = 4 : 5 

c : d = 6 : 7 

a : b : c : d = 2 × 4 × 6 : 3 × 4 × 6 : 3 × 5 × 6 : 3 × 5 × 7

a : d = 16 : 35 

∴ The required answer is 16 : 35

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