Question 319759
Thomas has an enormous stamp collection. He has wallpapered one wall of his house with stamps that are square with sides that are one and one-quarter inches long. How many stamps were used to cover the wall, which is 10 feet tall and 25 feet long?
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Assuming all the area of the wall is covered:
The area of the wall is 10*25 = 250 sq feet = 250*144 sq inches
Wall area = 36000 sq inches
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Stamp area = 1*1.25
# of stamps = 36000/1.25 
= 28800 stamps