Question 1043798: in the united states, 55 million computers, 32 million televisions, and 150 million cellphones were either disposed of or recycled in the past year. if 30% of computers, 20% of televisions, and 10% of cellphones were recycled, and the average weight of a television is ten times the average weight of a computer and 100 times the average weight of a cellphone, what is the approximate percentage by weight of recycled electronics made up of cellphones?
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! weight of cellphone=x
weight of a computer =100x
weight of a TV=1000x
16.5 million computers, 6.4 million televisions, and 15 million cellphones were recycled.
This is 1.65 x 10^9 x pounds for computers (16.5 million * 100x)
6.4 x 10 ^9 x pounds of televisions
1.5 x 10^7 x mpounds of cellphones.
The total weight is 8,065,000,000 x pounds, and 15,000,000x is cellphone
That fraction is 0.00186 or 0.186% cellphone (the x cancel) by weight.
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