tolong jawab pertanyaan saya....

Maaf kalau jawabannya salah

3a + 2a = 90.
5a = 90
a = 90 : 5
a = 18

46 + a + 29 + 5a + 15 = 180
6a = 180 - 46 - 29 - 15
6a = 90
a = 90 : 6
a = 15

semoga bermanfaat