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A certain type of concrete mixture is to be made of cement, sand and gravel in a ratio 1:3:5 by weight. What is the greatest number of kilograms of this mixture that can be made with 5 kilograms of cement ?
(A) \(13\frac{1}{2}\)
(B) \(15\)
(C) \(25\)
(D) \(40\)
(E) \(45\)
Source: OG 1988 Q1 PS Test Section-1
(A) \(13\frac{1}{2}\)
(B) \(15\)
(C) \(25\)
(D) \(40\)
(E) \(45\)
Source: OG 1988 Q1 PS Test Section-1
25 Dec 2015, 12:24
Kudos
Bookmarks
Hi All,
Ratio questions on the GMAT can be dealt with in a variety of different ways. This question is ultimately about the arithmetic involved, so as long as you understand the 'relationship' among the 3 ingredients, the math involved will be pretty easy.
We're given a ratio of cement, sand and gravel as 1:3:5 by weight. This means that for every 1 kg of cement, we'll mix in 3 kg of sand and 5kg of gravel....
1+3+5 = 9 kg of concrete
We're asked for the greatest number of kilograms of this mixture that can be made with 5 kilograms of cement...
From the prior work, we know that 1 kg of cement will get us 9 km of concrete. Since we're dealing with 5kg of cement, we'll end up with (5)(9) = 45 kg of concrete.
Final Answer:
GMAT assassins aren't born, they're made,
Rich
Ratio questions on the GMAT can be dealt with in a variety of different ways. This question is ultimately about the arithmetic involved, so as long as you understand the 'relationship' among the 3 ingredients, the math involved will be pretty easy.
We're given a ratio of cement, sand and gravel as 1:3:5 by weight. This means that for every 1 kg of cement, we'll mix in 3 kg of sand and 5kg of gravel....
1+3+5 = 9 kg of concrete
We're asked for the greatest number of kilograms of this mixture that can be made with 5 kilograms of cement...
From the prior work, we know that 1 kg of cement will get us 9 km of concrete. Since we're dealing with 5kg of cement, we'll end up with (5)(9) = 45 kg of concrete.
Final Answer:
GMAT assassins aren't born, they're made,
Rich
17 Jan 2016, 10:41
Kudos
Bookmarks
EMPOWERgmatRichC
Hi All,
Ratio questions on the GMAT can be dealt with in a variety of different ways. This question is ultimately about the arithmetic involved, so as long as you understand the 'relationship' among the 3 ingredients, the math involved will be pretty easy.
We're given a ratio of cement, sand and gravel as 1:3:5 by weight. This means that for every 1 kg of cement, we'll mix in 3 kg of sand and 5kg of gravel....
1+3+5 = 9 kg of concrete
We're asked for the greatest number of kilograms of this mixture that can be made with 5 kilograms of cement...
From the prior work, we know that 1 kg of cement will get us 9 km of concrete. Since we're dealing with 5kg of cement, we'll end up with (5)(9) = 45 kg of concrete.
Final Answer:
GMAT assassins aren't born, they're made,
Rich
Ratio questions on the GMAT can be dealt with in a variety of different ways. This question is ultimately about the arithmetic involved, so as long as you understand the 'relationship' among the 3 ingredients, the math involved will be pretty easy.
We're given a ratio of cement, sand and gravel as 1:3:5 by weight. This means that for every 1 kg of cement, we'll mix in 3 kg of sand and 5kg of gravel....
1+3+5 = 9 kg of concrete
We're asked for the greatest number of kilograms of this mixture that can be made with 5 kilograms of cement...
From the prior work, we know that 1 kg of cement will get us 9 km of concrete. Since we're dealing with 5kg of cement, we'll end up with (5)(9) = 45 kg of concrete.
Final Answer:
GMAT assassins aren't born, they're made,
Rich
I worked in this way, can you confirm that is right please?
since we have the ratio of cement, sand and grevel = 1:3:5, which makes a total of 9.
If I add 5 kg to cement I have to multiply also 3*5=15 and 5*5=25. If I sum these vaules I get 45.
Right?
