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Last year the world wide paper industry used over twice as [#permalink]

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30 Aug 2004, 16:19

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50% (01:51) correct
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Last year the world wide paper industry used over twice as much fresh pulp as recycled pulp. A paper industry analyst has project that by 2010 the industry will use at least as much recycled pulp as it does fresh pulp, while using a greater quantity of fresh pulp than it did last year.

if the info aboe is coorect and the analysts projects prove to be acurate which of the following projects must also be acurate
a. in 2010 the paper industry will use at least twice as much reclyed pulp as it did last year
b. in 2010 the paper industry will use at least twice as much total pulp as it did last year
c. in 2010 the paper industry will producre more paper froma given amount of pulp that is did last year
d. as compared with last year in 2010 the paper industry will make more paper that contains only recycled pulp
e. as compared with last year in 2010 the paper industry will make more paper that contains only fresh pulp

a. in 2010 the paper industry will use at least twice as much recycled pulp as it did last year
Iâ€™ll use a little maths here. Last year, assuming the amount of fresh pulp used is x, then the amount of recycled pulp is less than or equal to x/2 since weâ€™re told the industry use twice as much fresh pulp as recycled pulp. Fast forward to 2010, the industry now uses recycled pulp as fresh pulp. Assuming fresh pulp is now x+n (since a greater quantity is used), then the amount of fresh pulp is at least x+n. However, weâ€™re not sure if x+n >= 2x. So this choice is out.

b. in 2010 the paper industry will use at least twice as much total pulp as it did last year
- Using the same argument above, in the last year, the amount of pulp used is about x+x/2, while in 2010 it is 2x+2n. So we know the amount of total pulp is going to be at least twice that used last year.

c. in 2010 the paper industry will produce more paper froma given amount of pulp that is did last year
- Nothing about production of paper from is mentioned. This choice is out.

d. as compared with last year in 2010 the paper industry will make more paper that contains only recycled pulp
- Canâ€™t tell for sure

e. as compared with last year in 2010 the paper industry will make more paper that contains only fresh pulp
- Same as above

a. in 2010 the paper industry will use at least twice as much recycled pulp as it did last year Iâ€™ll use a little maths here. Last year, assuming the amount of fresh pulp used is x, then the amount of recycled pulp is less than or equal to x/2 since weâ€™re told the industry use twice as much fresh pulp as recycled pulp. Fast forward to 2010, the industry now uses recycled pulp as fresh pulp. Assuming fresh pulp is now x+n (since a greater quantity is used), then the amount of fresh pulp is at least x+n. However, weâ€™re not sure if x+n >= 2x. So this choice is out.

ywilfred u have made a folly
x+n >= 2*(x/2) which is x and not 2x => as you have taken x as fresh pulp x/2 will be as recycle pulp in last year.

SigEpUCI's reasoning is absolutely correct
The only answer possible is "A" here
Cheers,

=> Let FP increase marginally. In that case, RP has to double to meet FP at the minimum. Thus, only A is correct.

damit wrote:

Last year the world wide paper industry used over twice as much fresh pulp as recycled pulp. A paper industry analyst has project that by 2010 the industry will use at least as much recycled pulp as it does fresh pulp, while using a greater quantity of fresh pulp than it did last year.

if the info aboe is coorect and the analysts projects prove to be acurate which of the following projects must also be acurate a. in 2010 the paper industry will use at least twice as much reclyed pulp as it did last year b. in 2010 the paper industry will use at least twice as much total pulp as it did last year c. in 2010 the paper industry will producre more paper froma given amount of pulp that is did last year d. as compared with last year in 2010 the paper industry will make more paper that contains only recycled pulp e. as compared with last year in 2010 the paper industry will make more paper that contains only fresh pulp

Re: Last year the world wide paper industry used over twice as [#permalink]

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04 Apr 2012, 20:54

damit wrote:

Last year the world wide paper industry used over twice as much fresh pulp as recycled pulp. A paper industry analyst has project that by 2010 the industry will use at least as much recycled pulp as it does fresh pulp, while using a greater quantity of fresh pulp than it did last year.

if the info aboe is coorect and the analysts projects prove to be acurate which of the following projects must also be acurate a. in 2010 the paper industry will use at least twice as much reclyed pulp as it did last year b. in 2010 the paper industry will use at least twice as much total pulp as it did last year c. in 2010 the paper industry will producre more paper froma given amount of pulp that is did last year d. as compared with last year in 2010 the paper industry will make more paper that contains only recycled pulp e. as compared with last year in 2010 the paper industry will make more paper that contains only fresh pulp

Should be A B,D, & E may be true or may not be C -- new information which is not explicitly mentioned in the stimulus
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