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# A snack mix as made by combining 5 lbs of dried sereal costi

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Manager
Joined: 11 Aug 2009
Posts: 122
A snack mix as made by combining 5 lbs of dried sereal costi [#permalink]

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22 Aug 2009, 20:23
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A snack mix as made by combining 5 lbs of dried sereal costing $.80 a pound to peanuts that cost$2.40 a pound. How many pounds of peanuts must be added to have a mix that cost \$1.40 a pound?
Manager
Joined: 14 Aug 2009
Posts: 123

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22 Aug 2009, 21:07
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KUDOS
(5*0.8+2.4*x)/(5+x)=1.4

x=3
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Senior Manager
Status: mba here i come!
Joined: 07 Aug 2011
Posts: 264

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12 Jan 2012, 07:58
final ratio would be = 1.4-0.8 : 2.4-1.4 = 5:3

ans: 3
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Intern
Joined: 03 Jan 2013
Posts: 15

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23 Jan 2013, 09:02
I have a question as to why is there a "5 + x" in the denominator ..I understand everything else.
Intern
Joined: 25 Jul 2012
Posts: 31
Location: India
GMAT Date: 08-03-2013
WE: Engineering (Computer Software)

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23 Jan 2013, 09:29
pharm wrote:
I have a question as to why is there a "5 + x" in the denominator ..I understand everything else.

Pharm "5+x" is because this is based on Weighted average concept.

Total / Sum = Average
or
Total cost / Total weight = Average Cost

Here Total weight = (Weight * Cost ) + (Weight * Cost)
Total weight = sum of weights
Which results in average cost
Intern
Joined: 03 Jan 2013
Posts: 15
Re: A snack mix as made by combining 5 lbs of dried sereal costi [#permalink]

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23 Jan 2013, 10:46
Oh.. Wow a Eureka moment here! Thanks a lot!

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Re: A snack mix as made by combining 5 lbs of dried sereal costi   [#permalink] 23 Jan 2013, 10:46
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