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# One gallon of a soft drink is made of 40% orange juice and

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Manager
Joined: 23 Mar 2008
Posts: 221
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One gallon of a soft drink is made of 40% orange juice and [#permalink]  19 Apr 2008, 07:30
1
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One gallon of a soft drink is made of 40% orange juice and 60% water. How many additional gallons of orange juice must be mixed in to make the orange juice 60% of the soft drink?

a) 0.5
b) 1
c) 1.25
d) 1.5
e) 2
Director
Joined: 10 Sep 2007
Posts: 949
Followers: 7

Kudos [?]: 205 [1] , given: 0

Re: juice [#permalink]  19 Apr 2008, 09:08
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Lets say there is 100 Gallons of drink, so 40 Gallons orange juice and 60 Gallons orange juice.

Now we want to add x Gallons of orange juice, so that (40+x)*100/(100+x) = 60

=> 4000 + 100x = 6000 + 60x
=> 40x = 2000
=> x = 50

100 Gallons need = 50 Gallons
1 Gallon needs = 50/100 = 0.5 Gallon
Intern
Joined: 02 Apr 2008
Posts: 37
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Kudos [?]: 11 [1] , given: 0

Re: juice [#permalink]  20 Apr 2008, 12:08
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puma wrote:
One gallon of a soft drink is made of 40% orange juice and 60% water. How many additional gallons of orange juice must be mixed in to make the orange juice 60% of the soft drink?

a) 0.5
b) 1
c) 1.25
d) 1.5
e) 2

(0.4+X)/(1.0+X)=0.6
0.4+X =0.6+0.6X
0.4X=0.2
X=2/4=1/2=0.5 gallon
Re: juice   [#permalink] 20 Apr 2008, 12:08
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