The difference of two complementary angles is 30°. Then, the angles are
(a) 60°, 30°
(b) 70°, 40°
(c) 20°, 50°
(d) 105°, 75°
Let angles = x and y, x+y=90, x−y=30 ⇒ 2x=120 ⇒ x=60, y=30.