state gov Rajasthan Gram Vikas Adhikari (VDO) Mock Test 2021 Quantitative Aptitude Ratio and Proportion Compound Ratios

If a ∶ b = 4 ∶ 5 and c ∶ b = 2 ∶ 3, then what is the value of a ∶ b ∶ c? 

1
15 ∶ 5 ∶ 10
2
8 ∶ 10 ∶ 15
3
12 ∶ 15 ∶ 10
4
15 ∶ 10 ∶ 8
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