Question

If (11aᶾ  – 15bᶾ ) : (10aᶾ  + 4bᶾ ) = 5 : 7, then (9a + 5b) : (5a – 3b) is equal to:

A 10 : 7
B 13 : 5
C 15 : 4
D 14 : 9
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