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標題:

Math!!!!!! 20 pionts!!!!!!!!

發問:

Mr CHAN wants to pasts the walls of his bathroom with tiles of dimensions 6 inches X 8 inches. The dimensions of the bathroom are 8 ft. X 5ft. and its height is 9 ft. There are a door of 2.5 ft. X 7 ft. on one side of the walls and a window of 2 ft. X 1.5 on the other side of the walls.a)Estimate the total... 顯示更多 Mr CHAN wants to pasts the walls of his bathroom with tiles of dimensions 6 inches X 8 inches. The dimensions of the bathroom are 8 ft. X 5ft. and its height is 9 ft. There are a door of 2.5 ft. X 7 ft. on one side of the walls and a window of 2 ft. X 1.5 on the other side of the walls. a)Estimate the total area of the walls of the bathroom. b)Estimate the number of tiles needed if the walls must be fully covered with tiles. If one box of tiles contains 30 pieces, estimate the number of boxesof tiles needed. (Need列式)

最佳解答:

Qa) The total area of the walls of the bathroom = ( 8 ft x 9 ft ) x2 + ( 5 ft x 9 ft ) x2 = 72x2 + 45x2 sq.ft = 144 + 90 sq.ft = 234 sq.ft Qb) Area of the door: = 2.5 x 7 sq.ft = 17.5 sq.ft Area of the window: = 2 x 1.5 sq.ft = 3 sq.ft Area of the walls requires with tiles: = 234 - 17.5 - 3 = 213.5 sq.ft Area of a tile: = 6/12 x 8/12 sq.ft = 1/3 sq.ft number of tiles to cover the walls fully: = 213.5 / (1/3) = 640.5 Given that 1 box contains 30pcs of tiles, = 640.5 / 30 = 21.35 = 22 boxes Therefore, 22 boxes of tiles are needed to cover the walls fully.

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