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Answer:
let angle p be 2x
angle Q be 3x
and angle R be 4x
angle P ,angle Q and angle R on a straight line
so ,
2x + 3x+ 4x = 180⁰(linear pair)
9x = 180⁰
x = 180/9
x =20
therefore,
angle p = 2x = 2× 20= 40⁰
angle Q = 3x =3×20=60⁰
angle R =4x =4×20=80⁰
i hope it will help you...