Answer:
Jane has 11 books
Step-by-step explanation:
If Camilla has 15 and she has 4 more than Jane just subtract 15 - 4 = 11
uhmm. lemme remember how to do that
x = 25°
3x + 2x + x + 30° = 180°
6x + 30° = 180°
6x = 150°
x =25°
=> 3x = 25 * 3 = 75°
=> 2x = 25 * 2 = 50°
=> x + 30° = 25° + 30° = 55°
see picture for steps
x= 10
