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beat_gmat_09: Master | Next Rank: 500 Posts; Posts: 437; Joined: Sat Nov 22, 2008 5:06 am; Location: India; Thanked: 50 times; Followed by:1 members; GMAT Score:580

Weights

by beat_gmat_09 » Tue Dec 07, 2010 6:53 am

I didn't understand following question. Please help.

The weights of four packages are 1,3,5 and 7 pounds, respectively. Which of the following CANNOT be the total weight, in pounds, of any combination of the packages ?

A)9
B)10
C)12
D)13
E)14

Source: PowerPrep

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Source: Beat The GMAT — Problem Solving | Tue Dec 07, 2010 6:53 am

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by GMATGuruNY » Tue Dec 07, 2010 7:12 am

beat_gmat_09 wrote:I didn't understand following question. Please help.

The weights of four packages are 1,3,5 and 7 pounds, respectively. Which of the following CANNOT be the total weight, in pounds, of any combination of the packages ?

A)9
B)10
C)12
D)13
E)14

Source: PowerPrep

When a question includes a word in UPPER CASE LETTERS, reverse the word in upper case letters:

Which of the following COULD be the total weight?

Now find the 4 answers choices that answer the question above. The correct answer will be the remaining answer choice.

A) 9 = 1+3+5
B) 10 = 3+7
C) 12 = 5+7
D) 13 = 1+5+7

Since A, B, C and D could be the total weight, the correct answer is E. No combination of 1, 3, 5, and 7 will yield a sum of 14.

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beat_gmat_09: Master | Next Rank: 500 Posts; Posts: 437; Joined: Sat Nov 22, 2008 5:06 am; Location: India; Thanked: 50 times; Followed by:1 members; GMAT Score:580

by beat_gmat_09 » Tue Dec 07, 2010 7:25 am

GMATGuruNY wrote: When a question includes a word in UPPER CASE LETTERS, reverse the word in upper case letters:

Which of the following COULD be the total weight?

Now find the 4 answers choices that answer the question above. The correct answer will be the remaining answer choice.

A) 9 = 1+3+5
B) 10 = 3+7
C) 12 = 5+7
D) 13 = 1+5+7

Since A, B, C and D could be the total weight, the correct answer is E. No combination of 1, 3, 5, and 7 will yield a sum of 14.

By any combination i was trying 2 7's give 14. Two 5's One 3 and One 1 gives 14 !!
I was getting all the values