Question

A mover packs books,cds,and dvds into a moving box if the box contains 6.5kg of books 1.5kg of cds and 2.0kg of dvds what is the percent by mass of each object in the box

Answer 1

Answer:

books=65%, cds=15%, dvds=20%

Explanation:

6.5kg + 1.5kg + 2kg = 10kg

______________________

books   = 6.5/10

            = 65/100

            = 65%

______________________

cds       = 1.5/10

            = 15/100

            = 15%

________________________

dvds     = 2/10

             = 20/100

             = 20%

Answer 2

The percent  by mass of books , cds and dvds are 65%, 15 % and 20% respectively

Explanation:

Mass of books  = 6.5 kg

Mass of cds = 1.5 kg

mass of dvds = 2.0 kg

Total mass = Mass of books + Mass of cds + mass of dvds = 6.5 kg+ 1.5 kg  +2.0 kg = 10.0 kg

a. ${\text{percentage by mass of books}}=\frac{\text{mass of books}}{\text{Total Mass}}\times 100=\frac{6.5}{10.0}\times 100=65\%$

b. ${\text{percentage by mass of cds}}=\frac{\text{mass of cds}}{\text{Total Mass}}\times 100=\frac{1.5}{10.0}\times 100=15\%$

c. ${\text{percentage by mass of dvds}}=\frac{\text{mass of dvds}}{\text{Total Mass}}\times 100=\frac{2.0}{10.0}\times 100=20\%$

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