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A certain type of concrete mixture is to be made of cement, sand and g

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RSOHAL
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A certain type of concrete mixture is to be made of cement, sand and g [#permalink] New post   Updated on: 21 Jun 2023, 01:34
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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
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E

Originally posted by RSOHAL on 22 Dec 2015, 15:56.
Last edited by Bunuel on 21 Jun 2023, 01:34, edited 2 times in total.
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EMPOWERgmatRichC
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Re: A certain type of concrete mixture is to be made of cement, sand and g [#permalink] New post   25 Dec 2015, 12:24
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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:
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E


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Re: A certain type of concrete mixture is to be made of cement, sand and g [#permalink] New post   17 Jan 2016, 10:41
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EMPOWERgmatRichC wrote:
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:
Show Spoiler
E


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?
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Re: A certain type of concrete mixture is to be made of cement, sand and g [#permalink] New post   17 Jan 2016, 12:15
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Hi Pepo,

Yes, your idea is correct - I'm just going to 'edit' your language a bit...

You're STARTING with 5kg of cement. Since the ratio is 1:3:5, that means you're multiplying the "1" by "5" to get 5kg... so you have to multiply the other two numbers in the ratio by 5 (the "3" and the "5"). Doing so gives you...

5 kg cement + 15 kg sand + 25 kg gravel = 45 kg concrete

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Re: A certain type of concrete mixture is to be made of cement, sand and g [#permalink] New post   08 Sep 2021, 07:31
Correct option : E

Given Information : Ration of (Cement : Sand : Garvel) = (1 : 3 : 5)
To Find : mixture breakup of 5 kg brick
Total Mixture : (1x +3x +5x) = 9x

C+S+G
= \(\frac{1}{9}\) *5 + \(\frac{3}{9}\) *5 + \(\frac{5}{9}\) *5
= 5

(1*5 + 3*5 + 5*5) = 45 (Option E)
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Re: A certain type of concrete mixture is to be made of cement, sand and g [#permalink] New post   10 Jan 2024, 07:52
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RSOHAL wrote:
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


\(C : S : G = x:3x:5x\)

\(x\) represents \(5\), So \(x + 3x + 5x = 9x \) will be \(9*5 = 45\), Answer must be \((E) 45\)
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Re: A certain type of concrete mixture is to be made of cement, sand and g [#permalink]
10 Jan 2024, 07:52
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