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If a ∶ b = 2 ∶ 3, b ∶ c = 5 ∶ 7 and c ∶ d = 4 ∶ 5. Then find a ∶ b ∶ c ∶ d. 1. 40 ∶ 60 ∶ 84 ∶ 1052. 44 ∶ 60 ∶ 84 ∶ 1053. 40 ∶ 60 ∶ 84 ∶ 1074. 40 ∶ 64 ∶ 84 ∶ 105 |
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Answer» Correct Answer - Option 1 : 40 ∶ 60 ∶ 84 ∶ 105 Given: a ∶ b = 2 ∶ 3 b ∶ c = 5 ∶ 7 c ∶ d = 4 ∶ 5 Calculation: a ∶ b ∶ c ∶ d 2 ∶ 3 ∶ 3 ∶ 3 5 ∶ 5 ∶ 7 ∶ 7 4 ∶ 4 ∶ 4 ∶ 5 ⇒ (2 × 5 × 4) ∶ (3 × 5 × 4) ∶ (3 × 7 × 4) ∶(3 × 7 × 5) ⇒ 40 ∶ 60 ∶ 84 ∶ 105 ∴ a ∶ b ∶ c ∶ d = 40 ∶ 60 ∶ 84 ∶ 105 The correct option is 1 i.e. 40 ∶ 60 ∶ 84 ∶ 105 |
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