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If a ^(2) + b ^(2) + c ^(2) = 16, x ^(2)...

If `a ^(2) + b ^(2) + c ^(2) = 16, x ^(2) + y ^(2) + z^(2) = 25 and ax + by + cz = 20 ` then the value of `(a + b + c)/( x + y + c)`

A

`3//5`

B

`5//3`

C

`4//5`

D

`5//4`

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