9. Find an angle which is two-thirds of its complement
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Answer: Let one angle be x
∴ x + x = 90
LCM= 3
∴ 3x + 2x /3 = 90
∴ 5x = 270
∴ x = 54
∴ 2/3 × 54 = 36°
∴ The required angle is 36°
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