neither presence of instruments for "measuring out" was mentioned. one of those disputable test questions. imho 4mishelk wrote: Also nothing was mentioned about the grey paint being directly made from the containers or measuring instruments being absent.
I go with (B).
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Mixture Prob
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.
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.
Cheers !!
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Quant 47-Striving for 50
Verbal 34-Striving for 40
My gmat journey :
https://www.beatthegmat.com/710-bblast-s ... 90735.html
My take on the GMAT RC :
https://www.beatthegmat.com/ways-to-bbla ... 90808.html
How to prepare before your MBA:
https://www.youtube.com/watch?v=upz46D7 ... TWBZF14TKW_
-
prateek_guy2004
- Master | Next Rank: 500 Posts
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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)
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)
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
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
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.
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.
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)
= (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)
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rohan.saha86
- Newbie | Next Rank: 10 Posts
- Posts: 3
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 ..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
so B 2.5
