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# A certain type of concrete mixture

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A certain type of concrete mixture [#permalink]  13 Aug 2009, 14:30
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50% (01:24) correct 50% (00:49) wrong based on 16 sessions
A certain type of concrete mixture is to be made of cement, sand and graved 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 ?

1. 13 1/2
2. 15
3. 25
4. 40
5. 45

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Re: A certain type of concrete mixture [#permalink]  13 Aug 2009, 15:13
1
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tejal777 wrote:
A certain type of concrete mixture is to be made of cement, sand and graved 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 ?

1. 13 1/2
2. 15
3. 25
4. 40
5. 45

Its E indeed!

SOL:
Cement:sand:gravel = 1:3:5

=> If we have 5 kg cement then, we should mix it with 5*3 = 15 kg sand and 5*5 = 25 kg gravel.
=> Total weight of the mixture (in kg) = 5 + 15 + 25 = 45 Kg

ANS: E
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Re: A certain type of concrete mixture [#permalink]  13 Aug 2009, 15:15
5(1) + 5(3) + 5(5)
= 5 + 15 + 25
= 45

The ratio is already measured by weight of the 3 elements of the mixture. So if you have 5kg of cement just multiply everything by 5 and add up to get the total number of kg.
Manager
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Re: A certain type of concrete mixture [#permalink]  17 Aug 2009, 22:32
1
KUDOS
tejal777 wrote:
A certain type of concrete mixture is to be made of cement, sand and graved 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 ?

1. 13 1/2
2. 15
3. 25
4. 40
5. 45

Given Cement = 1/9th of the mixture.
Hence, if the cement is 5, we have

5 = 1/9th of mixture
9*5 = Mixture = 45.
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Re: A certain type of concrete mixture [#permalink]  26 Jun 2011, 16:31
Relatively Easy ratio / mixture problem...

E!
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Re: A certain type of concrete mixture [#permalink]  11 Dec 2011, 08:26
total x
x*1/9 = 5
x = 45
Ans. E
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Manager
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Re: A certain type of concrete mixture [#permalink]  11 Dec 2011, 22:10
yes indeed its E 45
1+3+5 = 9

here 1 part cement =5
so 9 part = 45
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Re: A certain type of concrete mixture [#permalink]  15 Dec 2011, 11:41
the ratios are : 1:3:5 = 1+3+5=9
The only multiple of 9 is 45
Ans. E
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PSof OG solved by GC members: http://gmatclub.com/forum/collection-ps-with-solution-from-gmatclub-110005.html
DS of OG solved by GC members: http://gmatclub.com/forum/collection-ds-with-solution-from-gmatclub-110004.html
100 GMAT PREP Quantitative collection http://gmatclub.com/forum/gmat-prep-problem-collections-114358.html
Collections of work/rate problems with solutions http://gmatclub.com/forum/collections-of-work-rate-problem-with-solutions-118919.html
Mixture problems in a file with best solutions: http://gmatclub.com/forum/mixture-problems-with-best-and-easy-solutions-all-together-124644.html

Re: A certain type of concrete mixture   [#permalink] 15 Dec 2011, 11:41
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