1.

If a ∶ b = 3 ∶ 2, b ∶ c = 5 ∶ 7 and d ∶ c = 3 ∶ 4. Then find a ∶ b ∶ c ∶ d.1. 17 ∶ 20 ∶ 28 ∶ 132. 28 ∶ 20 ∶ 22 ∶ 213. 30 ∶ 20 ∶ 28 ∶ 214. 30 ∶ 25 ∶ 28 ∶ 27

Answer» Correct Answer - Option 3 : 30 ∶ 20 ∶ 28 ∶ 21

Given:

a ∶ b = 3 ∶ 2

b ∶ c = 5 ∶ 7

c ∶ d = 4∶ 3

Calculation:

a ∶ b ∶ c ∶ d

3 ∶ 2 ∶ 2 ∶ 2

5 ∶ 5 ∶ 7 ∶ 7

4 ∶ 4 ∶ 4 ∶ 3

⇒ (3 × 5 × 4) ∶ (2 × 5 × 4) ∶ (2 × 7 × 4) ∶(2 × 7 × 3)

⇒ 60 ∶ 40 ∶ 56 ∶ 42

⇒ 30 ∶ 20 ∶ 28 ∶ 21

∴ a ∶ b ∶ c ∶ d =30 ∶ 20 ∶ 28 ∶ 21

The correct option is 3 i.e.30 ∶ 20 ∶ 28 ∶ 21



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