142715752 rounded to the nearest tenth ?

Turner's mom measured his room to see how long the wallpaper border needed to be. if two walls are 15 feet long and two walls are 12 feet long, how long should the strip of border be cut?

Hi my sisters and brothers can tell me the answer because i don’t understand the question

In a sale there is 25% of all prices a chair costs £45 in sale how much was it before the sale