25°
Angles in a circle add up to 360°
5a + (a + 60) + (2a + 100) = 360
5a + 3a + 160 = 360
5a + 3a = 8a
8a + 160 = 360
Make a the subject
8a = 200
200 ÷ 8 = 25°
Have a great day <3
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