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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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The correct Answer is:
D
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