In a triangle ABC, if (b+c) / 11 = (c+a)...

In a triangle `ABC`, if `(b+c) / 11 = (c+a) / 12 = (a+b) / 13` then ` cosA / l = cosB / m = cosC / n` where `l, m, n` are least positive integer. Find the value of `(l+m+n)`.

A

(a) `51`

B

(b) `47`

C

(c) `25`

D

(d) `60`

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The correct Answer is:

B

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