43.5 inches of space should be left between the wall edge and posters.
Step-by-step explanation:
Width of 1 poster = 42 inches
∴ Width of 2 posters = 2 × 42 = 84 in
Remaining width = 171 - 84 = 87 in
Space between wall and poster = 87/2 = 43.5 in
Answer:
29
Step-by-step explanation:
42x2=84
171-84=87
87/3=29 inches of space.