In a triangleABC, if angleA+angleC = 140...

In a `triangleABC`, if `angleA+angleC = 140^@` and `angleA + 3 angleB = 180^@`, the `angleA` is equal to (A) `80^@` (B) `40^@` (C ) `60^@` (D) `20^@`

A

B

C

D

A

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