How many photos must Lara buy?

Question

Lara is wanting to cover a wall in a collage. She has no measuring tools so she uses a wrapping paper roll. The wrapping paper roll is 3.33ft long. The width of the wall is equal to 3 rolls of wrapping paper. The length equals 2.5 rolls. The images Lara is ordering are 4x6in prints. How many images does Lara need to buy to cover the entire wall?

Answer 1

Width of the wall = 3 * length of wrapping roll = 3 * 3.33 = 9.99 ft or

Length of the wall = 2.5 * length of the roll = 2.5 * 3.33 = 8.325 ft

Area of the wall = length * width = 9.99 * 8.325 = 83.16675 sq. ft.

Area of images = 4 * 6 = 24 inch or 0.166667 sq feet.

So the required number of images = 498.99 or 499 (rounded)

So Lara should buy 499 images.