Delisha is putting backsplash tiles in her kitchen. The wall area where she plans

to place her tiles is 40 inches by 20 inches. The tiles are four inches by four
inches. She plans to buy 10% extra to be safe. How many tiles should she buy?

2 answers

in terms of tiles, the area is 10x5
So, 50 tiles + 10% = 55 tiles
40*20/4*4 = 800in^2/16^2 = 50 tiles required.
50+0.1*50 = 55 tiles bought.