i would be odliged if you could work it out but if u can't, that's fine. wot does it mean by side? the area? or just one side of it?
2006-12-02 10:13:24 · 5 answers · asked by Emily 1 in Science & Mathematics ➔ Mathematics
5x20=100
100x10=10000
20x20=400
10000/400=25
why does my tesxt book say 25000? i must be doing it wrong ugg
2006-12-02 10:23:31 · update #1
no of tiles=area of th floor/area of 1 tile
=500*2000/20*20
=2500 tiles
2006-12-02 10:23:08 · answer #1 · answered by raj 7 · 0⤊ 0⤋
You are getting the wrong answer because you are trying to divide meters by centimeters. Convert it to centimeters. The floor is 500 x 2000 cm. That means it's 1,000,000 cm^2. The tiles are 20 x 20 cm, or 400cm^2. So it takes (1,000,000/400) = 2500 tiles to cover it.
If your textbook really says 25000 then you have a faulty textbook.
2006-12-02 18:33:01 · answer #2 · answered by Amy F 5 · 0⤊ 0⤋
Sides = 20cm long Area = 20 x 20 = 400 cm2
100cm / 1m
Therefore, floor area = 1 million cm2
1 million cm2 / 400 cm2 = 2500 tiles.
2006-12-02 18:27:40 · answer #3 · answered by wilbedoc2003 2 · 0⤊ 0⤋
By side 20 cm, it means that the tiles are 20 cm by 20 cm.
20 cm goes into 5m 25 times, and 20m 100 times. That means it will take 25*100= 2500 tiles.
2006-12-02 18:18:09 · answer #4 · answered by dennismeng90 6 · 0⤊ 0⤋
2500
2006-12-02 18:26:38 · answer #5 · answered by Kevin P 1 · 0⤊ 0⤋