Question

A rectangular photo has a length of 3 inches and a width of 5 inches. A rectangular poster is 15 feet wide. If the photo and poster are similar rectangles, find the length of the poster.

Answer 1

3 is to 15 and 5 is to x
they are the same ratio so
3:15=5:x
3/15=5/x
1/5=5/x
5/25=5/x
x=25
the leghtn of the poster is 25 feet