tolong jawab pakai cara ya

3x + 2x + x + 15 = 180.
6x = 180 - 15.
6x = 165.
x = 165/6.
x = 27,5.

A = 2x.
A = 2(27,5).
A = 55.

Jawaban : A.

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CBA = 180 - 140.
CBA = 40.

2y + 10 + y + 10 + 40 = 180.
3y = 180 - 40 - 10 - 10.
3y = 120.
y = 120/3.
y = 40.

CAB = y + 10.
CAB = 40 + 10.
CAB = 50.

Jawaban : C.