3people share restaurant bill of £30, therefore £10 each. waiter realises bill should have been £25, keeps £2 for himself, gives £3 back to customers. the customers have now paid £9 each 3 x 9 = 27. 27+2= 29. where has the additional £1 gone

Based on what i know about mean, this doesn't add up.

Im literally having a mental breakdown

The art class is planning to paint a mural on an outside wall. this figure is a scale drawing of the wall. width: 11 in length: 28 in unit rate: 1.5 ft per in. write the ratio of the area of the drawing to the area of the actual mural. write your answer as a unit rate. show that this unit rate is equal to the square of the unit rate 1.5 ft per in