Answer:
All 3 are 65
Step-by-step explanation:
a. 5 and 8 are supp. so 5 = 180 - 105 = 65
b. 5 and 11 are alt ext so equal --> 11 = 5 = 65
c. 1 and 16 are ss-ext so 16 = 180 - 115 = 65
