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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
Joined: 27 Sep 2015
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GMAT 1: 410 Q33 V13
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A certain type of concrete mixture is to be made of cement, sand and g  [#permalink]

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Updated on: 13 Nov 2018, 01:43
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5% (low)

Question Stats:

91% (00:35) correct 9% (00:47) wrong based on 190 sessions

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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: OG 1988 Q1 PS Test Section-1

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Originally posted by RSOHAL on 22 Dec 2015, 14:56.
Last edited by HKD1710 on 13 Nov 2018, 01:43, edited 1 time in total.
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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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25 Dec 2015, 11:24
1
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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Special Offer: Save $75 + GMAT Club Tests Free Official GMAT Exam Packs + 70 Pt. Improvement Guarantee www.empowergmat.com/ *****Select EMPOWERgmat Courses now include ALL 6 Official GMAC CATs!***** Manager Joined: 21 Jan 2014 Posts: 96 GMAT 1: 500 Q32 V28 GPA: 4 Re: A certain type of concrete mixture is to be made of cement, sand and g [#permalink] ### Show Tags 17 Jan 2016, 09:41 1 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? EMPOWERgmat Instructor Status: GMAT Assassin/Co-Founder Affiliations: EMPOWERgmat Joined: 19 Dec 2014 Posts: 13346 Location: United States (CA) GMAT 1: 800 Q51 V49 GRE 1: Q170 V170 Re: A certain type of concrete mixture is to be made of cement, sand and g [#permalink] ### Show Tags 17 Jan 2016, 11:15 2 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 GMAT assassins aren't born, they're made, Rich _________________ 760+: Learn What GMAT Assassins Do to Score at the Highest Levels Contact Rich at: Rich.C@empowergmat.com # Rich Cohen Co-Founder & GMAT Assassin Special Offer: Save$75 + GMAT Club Tests Free
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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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21 Sep 2018, 11:17
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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, 11:17
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# A certain type of concrete mixture is to be made of cement, sand and g

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