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Mixture Prob

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ma127 Just gettin' started!
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Post Sun Jun 19, 2011 10:35 pm
mishelk wrote:
Also nothing was mentioned about the grey paint being directly made from the containers or measuring instruments being absent.

I go with (B).
neither presence of instruments for "measuring out" was mentioned. one of those disputable test questions. imho 4

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Post Mon Jun 20, 2011 8:23 am
Hi, I guess the fastest approach is plugging here,

option B :

if I take 1 litre of white paint, i will have 300*3- 3 parts of white with me
if I take 1.5 litre of black paint, i will have 300*5- 5 parts of black with me


total qty of solution = 2.4 litres which is > 2litres

thus B is the answer.

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Post Tue Aug 02, 2011 11:38 am
White Paint Requirement = (3/8)*2 = 3/4 = 0.75 gallons
Black Paint Requirement = (5/8)*2 = 5/4 = 1.25 gallons

If we consider purchase of minimum gallons of paint..
- 1 gallon of white paint would suffice.
- 1.5 gallons of black paint would suffice.
- Total 2.5 gallons would be needed. (B)

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Post Wed Aug 03, 2011 12:32 am
IMO B

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Post Sat Aug 13, 2011 8:47 am
3:5:8

0.75 : 1.25 : 2

total = 1 + 1.5 = 2.5

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Post Sat Aug 13, 2011 9:00 am
IMO:B
Ratio:

3:5
1.5:2.5
0.75:1.25

But we are allowed to buy only .5 gallons, so it has to be 1.00:1.50 =2.5 Gallons

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Post Sun Aug 21, 2011 7:16 am
what is the source for this question ?

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Post Thu Oct 20, 2011 10:23 am
B - 2.5

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Post Fri Dec 16, 2011 3:44 pm
White Paint= 3X2/8= 3/4 gallons= 0.75 gallons
Black Paint= 5X2/8= 5/4 gallons= 1.25 gallons

So the least amount of paint that can be bought is 1 gallon for white paint and 1+0.5 gallon for black paint.

Total= 2.5 gallons.

B Wins.

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Post Wed Dec 28, 2011 8:08 pm
Let's calculate how much is needed for 2 gallon mixture first.
= (3/8)*2 = 0.75 gallon -- Paint1
= (5/8)*2 = 1.25 gallon -- Paint2

Now round up to nearest 1 gallon or .5 gallon

Paint1 = 1.0 gallon
Paint2 = 1.5 gallon
Total Paint = 2.5 gallon (ANSWER)

rohan.saha86 Just gettin' started!
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Post Mon Feb 27, 2012 5:14 am
The answer is 2.5 gallons

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Post Fri Jul 06, 2012 9:39 pm
We need 1 for white and 1.5 for Black

So, 2.5 Gallons.

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Post Sat Jul 28, 2012 4:38 am
selango wrote:
A certain shade of gray paint is obtained by mixing 3 parts of white paint with 5 parts of black paint. If 2 gallons of the mixture is needed and the individual colors can be purchased only in one-gallon or half- gallon cans, what is the least amount of paint, in gallons, that must be purchased in order to measure out the portions needed for the mixture?

(A) 2
(B) 2.5
(C) 3
(D) 3.5
(E) 4
I am not able to solve it so going for guessing .. it asks minimum so 2 is minimum option here but mostly it it will not be the correct answer .. so choosing something which is near to it ..

so B 2.5

rajeshsinghgmat Really wants to Beat The GMAT! Default Avatar
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Post Mon Feb 11, 2013 7:43 pm
E as in PaintEr.

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