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If frac 3a + 5b 3a - 5b = 5 &nbsp...

This question belongs to Arithmetic Ability Algebra
Algebra
?

If $$\frac{{3a + 5b}}{{3a - 5b}} = 5,$$   then a : b is equal to?

Answer & Solution
Correct Answer: Option D
$$\eqalign{ & \frac{{3a + 5b}}{{3a - 5b}} = 5 \cr & \Rightarrow 3a + 5b = 15a - 25b \cr & \Rightarrow 12a = 30b \cr & \Rightarrow 2a = 5b \cr & a:b \cr & 5:2 \cr} $$
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