Answer:
Patricia initially had 263 posters.
Step-by-step explanation:
p - 77 = 186
p = 186 + 77
p = 263
Patria sold: 77 posters
Had left: 186 posters
Equation:
p - 77 = 186
Solve:
p - 77 = 186
+ 77 +77
-----------------
p = 263
She had 263 posters originally.
Hope I helped!
-Char