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# Three company of soldiers containing 120, 192, and 144 soldiers are to

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Math Expert
Joined: 02 Sep 2009
Posts: 64139
Three company of soldiers containing 120, 192, and 144 soldiers are to  [#permalink]

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24 Feb 2020, 04:39
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Difficulty:

85% (hard)

Question Stats:

40% (02:16) correct 60% (02:10) wrong based on 50 sessions

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Three company of soldiers containing 120, 192, and 144 soldiers are to be broken down into smaller groups such that each group contains soldiers from one company only and all the groups have equal number of soldiers. What is the least number of total groups formed?

A. 8
B. 12
C. 19
D. 24
E. 38

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Joined: 19 Oct 2018
Posts: 1865
Location: India
Re: Three company of soldiers containing 120, 192, and 144 soldiers are to  [#permalink]

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24 Feb 2020, 12:35
HCF (120,192,144)= 24

Least number of such groups= (120/24) + (192/24)+ (144/24)= 5+8+6= 19

Bunuel wrote:
Three company of soldiers containing 120, 192, and 144 soldiers are to be broken down into smaller groups such that each group contains soldiers from one company only and all the groups have equal number of soldiers. What is the least number of total groups formed?

A. 8
B. 12
C. 19
D. 24
E. 38

Are You Up For the Challenge: 700 Level Questions
GMAT Club Legend
Joined: 18 Aug 2017
Posts: 6297
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
Re: Three company of soldiers containing 120, 192, and 144 soldiers are to  [#permalink]

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25 Feb 2020, 07:34
for 120,192 & 144 l HCF ; 2^3*3 ; 24
120/24+192/24+144/24 = 5+8+6 ; 19
IMO C

Bunuel wrote:
Three company of soldiers containing 120, 192, and 144 soldiers are to be broken down into smaller groups such that each group contains soldiers from one company only and all the groups have equal number of soldiers. What is the least number of total groups formed?

A. 8
B. 12
C. 19
D. 24
E. 38

Are You Up For the Challenge: 700 Level Questions
CEO
Joined: 03 Jun 2019
Posts: 2921
Location: India
GMAT 1: 690 Q50 V34
WE: Engineering (Transportation)
Re: Three company of soldiers containing 120, 192, and 144 soldiers are to  [#permalink]

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25 Feb 2020, 08:46
1
Bunuel wrote:
Three company of soldiers containing 120, 192, and 144 soldiers are to be broken down into smaller groups such that each group contains soldiers from one company only and all the groups have equal number of soldiers. What is the least number of total groups formed?

A. 8
B. 12
C. 19
D. 24
E. 38

Are You Up For the Challenge: 700 Level Questions

HCF (120,192,144) = 24

Number of groups (min) = 120/24 + 192/24 + 144/24 = 5 + 8 + 6 = 19

IMO C
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Re: Three company of soldiers containing 120, 192, and 144 soldiers are to  [#permalink]

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02 Mar 2020, 06:00
Bunuel wrote:
Three company of soldiers containing 120, 192, and 144 soldiers are to be broken down into smaller groups such that each group contains soldiers from one company only and all the groups have equal number of soldiers. What is the least number of total groups formed?

A. 8
B. 12
C. 19
D. 24
E. 38

We need to find the greatest common factor (GCF) of 120, 192, and 144. First we can prime factorize them:

120 = 12 x 10 = 2^3 x 3^1 x 5^1

192 = 2 x 96 = 2 x 2 x 48 = 2^6 x 3^1

144 = 12 x 12 = 2^4 x 3^2

So, the GCF of 120, 192, and 144 is 2^3 x 3^1 = 24, so there will be 24 soldiers in each group.

Thus, the smallest number of groups is 120/24 + 192/24 + 144/24 = 5 + 8 + 6 = 19.

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Three company of soldiers containing 120, 192, and 144 soldiers are to  [#permalink]

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02 Mar 2020, 07:07
We need to find the biggest number that divides all three. Find prime factors and find numbers that are common i.e....

120 --> (2^3) * 3 * 5. (5 not common so ignore)
144 --> (2^4) * 3^2
192 --> (2^5) * 3

What's common amongst all three? 2^3 * 3 = 24.

Divide 120, 144, & 192 by 24.
5 + 6 + 8 = 19.
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Three company of soldiers containing 120, 192, and 144 soldiers are to   [#permalink] 02 Mar 2020, 07:07