Quantitative Aptitude Ratio and Proportion Simple Ratios

\({a+ b\over 4} = {b+ c\over 7}= {c+ a\over 9}\) எனில், \({2(a+b + c)\over a + b}\) இன் மதிப்பு என்ன?

1
20
2
15
3
5
4
10

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