railway RPF Constable Mock Test Series 2024 Quantitative Aptitude Ratio and Proportion Simple Ratios

If a ∶ b = 5 ∶ 1, then what is the value of 3a + 4b ∶ 3a - 4b? 

1
19 ∶ 11
2
13 ∶ 21
3
14 ∶ 11
4
11 ∶ 12
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