Answer: 312 square inches
Step-by-step explanation:
Given: The first poster was 78 square inches.
Also, The second poster was 3 times larger than the first.
The area of second poster = 3 x (First poster)
= 3 x (78) square inches
= 234 square inches
The area of both posters = Area of first poster + Area of second poster
= (78+234) square inches
= 312 square inches
Hence, the posters were 312 square inches large altogether.
