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If a : b = 3 :sqrt5, then the value of (...

If `a : b = 3 :sqrt5`, then the value of (2a + b) : (3a - 2b) is:
यदि `a : b = 3 :sqrt5`, तो (2a + b): (3a -2b) का मान है:

A

`1/64 (64+21 sqrt5)`

B

`1/62 (64+21 sqrt5)`

C

`1/63 (64+21 sqrt5)`

D

`1/61 (64+21 sqrt5)`

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