campus placement eLitmus Test Series Quantitative Aptitude Ratio and Proportion Simple Ratios

If a/b = 3/4 and b/c = 12/18, then \(\frac{{9{c^2} - 6{a^2}}}{{40{c^2}\; + \;15{a^2}}}\) is equal to

1
2/11
2
2/55
3
3/45
4
6/35
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