molly7654
09.10.2019 •
Mathematics
You want to wallpaper a room. your room is 10 feet by 12 feet and the ceiling height is 10 feet. a double roll of wallpaper covers approximately 56 square feet of wall. how many double rolls of wallpaper should you buy?
9 double rolls
6 double rolls
8 double rolls
7 double rolls
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Ответ:
SA = 12 * 10 * 2 (for the two 12 ft long walls) = 240 ft^2
SA = 10 * 10 * 2 (for the two 10 ft long walls = 200 ft^2
200 + 240 = 440 total square feet of wall space.
Each double roll covers 56 sq ft.
440/56 = 7.86 double rolls; you cannot buy a partial double roll so we need to buy 8 double rolls
Ответ:
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