If a : b = 5 : 7 a : b = 5 : 7 a : b = 5 : 7 , then find the ratio 6 a 2 − 2 b 2 b 2 − a 2 \frac{6a^2 - 2b^2}{b^2 - a^2} b 2 − a 2 6 a 2 − 2 b 2 .

SSC SSC CGL Tier 1 Easy Number System MCQ

Question

If $a : b = 5 : 7$ , then find the ratio $\frac{6a^2 - 2b^2}{b^2 - a^2}$ .

Options

A.

$12 : 5$

B.

$21 : 5$

C.

$13 : 6$

D.

$17 : 8$

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