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C
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Difficulty:
65%
(hard)
Question Stats:
58% (02:12) correct
42%
(02:43)
wrong
based on 256
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T.O. Sets gave me trouble, so I came up with another example to practice. Hope it helps you, too.
Three walls have wallpaper covering a combined area of 300 square meters. By overlapping the wallpaper to cover a wall with an area of 180 square meters, the area that is covered by exactly two layers of wallpaper is 36 square meters. What is the area that is covered with three layers of wallpaper?
A. 5 Square Meters
B. 36 Square Meters
C. 42 Square Meters
D. 83.3 Square Meters
E. 120 Square Meters
Three walls have wallpaper covering a combined area of 300 square meters. By overlapping the wallpaper to cover a wall with an area of 180 square meters, the area that is covered by exactly two layers of wallpaper is 36 square meters. What is the area that is covered with three layers of wallpaper?
A. 5 Square Meters
B. 36 Square Meters
C. 42 Square Meters
D. 83.3 Square Meters
E. 120 Square Meters
14 Nov 2010, 20:46
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rockzom
300 - 180 = 120 sq m of the wallpaper overlaps (in either two layers or three layers)
If 36 sq m has two layers, 120 - 36 = 84 sq m of the wallpaper overlaps in three layers. 84 sq m makes two extra layers hence the area over which it makes two extra layers is 42 sq m.
Answer (C).
Similar question:
three-rugs-have-a-combined-area-of-102326.html
This question has 'Rug' instead of 'Wallpaper'
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