The difference between the largest and smallest angles of a triangle whose angles are in the ratio 5:3:10 is:
Answer: C
Let the angles be 5x, 3x, and 10x.
5x + 3x + 10x = 180°
18x = 180° => x = 10°
The angles are 50°, 30°, and 100°.
The largest angle is 100° and the smallest is 30°.
The difference is 100° - 30° = 70°.