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

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Ryerson (Ted Rogers) Thread Master
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A certain type of concrete mixture is to be made of cement, sand and g  [#permalink]

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New post 22 Dec 2015, 15:56
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A certain type of concrete mixture is to be made of cement, sand and graved (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: Test 1, PS, Q1, P47

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Re: A certain type of concrete mixture is to be made of cement, sand and g  [#permalink]

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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.

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Re: A certain type of concrete mixture is to be made of cement, sand and g  [#permalink]

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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:

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]

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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]

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Re: A certain type of concrete mixture is to be made of cement, sand and g &nbs [#permalink] 21 Sep 2018, 12:17
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