Question: If (10a 3 + 4b 3 ) : (11a 3 15b 3 ) = 7 : 5, then (3a + 5b) : (9a

If (10a3 + 4b3) : (11a3 – 15b3) = 7 : 5, then (3a + 5b) : (9a – 2b) = ?

(A) 10 : 13

(B) 8 : 7

(C) 5 : 4

(D) 3 : 2

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