Question

You are wallpapering a 10-foot long wall. The wall is 10 feet high, and without doors and windows. The solid-colored wallpaper you've selected is 30 inches wide and comes in 20-foot rolls.
How many widths of paper will it take to cover the wall? How many rolls of wallpaper must you buy to get this total length?

Answers

width is 10*12 = 120 inches
So, it takes 120/4 widths

Since the wall is an exact number of widths, we just need to figure the length to find the rolls.

10*12*4 = 480 in long
so, we need 480/(20*12) = 2 rolls

Makes sense, since each roll does 2 strips, and we need 4 strips.

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