A gift shop uses two sizes of boxes for presents. These boxes have exactly the same shape. The smaller box is

for 8in box, let say the wrapping paper required is K. sides^2

k*8^2 = 320

k = 5

therefore, wrapping paper required for big box with side 13 in is

= k*13^2

= 5*169

= 845 in square

hence, 845 in sq of wrapping paper is required to wrap big box.

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