Quantitative Aptitude Ratio and Proportion Simple Ratios

a ∶ b = 9 ∶ 7 అయితే, (11a - 9b) ∶ (2a + 3b) విలువ ఎంత?

1

12 ∶ 13

2

54 ∶ 13

3

4 ∶ 21

4

4 ∶ 13

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