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Sheena is wrapping boxes using a roll of wall paper with a total area of 3.5 m2. Each box has a 20 cm width, 20 cm length, and 40 cm height. If Sheena uses 20% extra paper on each box, how many boxes can she wrap? Show your work. 

 Apr 23, 2020
 #1
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Total surface area  =  2·length·width + 2·length·height + 2·width·height

                               =  2·20·20  +  2·20·40  +  2·20·40  =  4000 cm2

 

Adding an extra 20%:  20% of 4000  =  800     --->     4800 cm2

 

There are  10 000 cm2  in 1 m2, so there are 3.5 x 10 000  =  35 000 cm2  of wrapping paper.

 

35 000 cm2  /  4800 cm2  =  7.3 boxes  =  7 boxes.

 Apr 23, 2020

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