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problem 80 drinks given to a group of people

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by neilcao » Mon Feb 21, 2011 6:55 am
80 bottles of drink are given to a group of people, the remaining number of drinks is 4 less than the number given to each person, which number cannot be the actual number of people in this group?


21 28 14 17 24

Suppose the total number of drinks is given evenly to each person
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by mk101 » Mon Feb 21, 2011 7:17 am
neilcao wrote:80 bottles of drink are given to a group of people, the remaining number of drinks is 4 less than the number given to each person, which number cannot be the actual number of people in this group?


21 28 14 17 24

Suppose the total number of drinks is given evenly to each person
are you sure you copied the above question correctly. If the info provided is correct then 21,28 and 24 , none of them are possible . and 14, 17 do not make sense either.

In case the no of people in the group =21, then each person gets at most 3 bottles each ...hence it is not possible to have remaining number of drinks = 4 less than the number provided to each person.
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by stormier » Mon Feb 21, 2011 7:23 am
neilcao wrote:80 bottles of drink are given to a group of people, the remaining number of drinks is 4 less than the number given to each person, which number cannot be the actual number of people in this group?


21 28 14 17 24

Suppose the total number of drinks is given evenly to each person
let m drink be given to each of the n persons in the group.

remaining number of drinks = 80-mn = m-4

=> m(n+1)=84

question asks, which cannot be n

A. if n=21; m = 84/22 =

B. if n=28; m = 84/29 =

C. if n=14; m = 84/15 =

D. if n=17; m = 84/18 =

E. if n=24; m = 84/25 =

All are fractions - so none could be the actual number of people.
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by Night reader » Mon Feb 21, 2011 7:37 am
@stormier, don't puzzle yourself - it's done... i just looked back if some one comes with the comment about this

hey man, neilcao please shed the light
stormier wrote:
neilcao wrote:80 bottles of drink are given to a group of people, the remaining number of drinks is 4 less than the number given to each person, which number cannot be the actual number of people in this group?


21 28 14 17 24

Suppose the total number of drinks is given evenly to each person
let m drink be given to each of the n persons in the group.

remaining number of drinks = 80-mn = m-4

=> m(n+1)=84

question asks, which cannot be n

A. if n=21; m = 84/22 =

B. if n=28; m = 84/29 =

C. if n=14; m = 84/15 =

D. if n=17; m = 84/18 =

E. if n=24; m = 84/25 =

All are fractions - so none could be the actual number of people.
My knowledge frontiers came to evolve the GMATPill's methods - the credited study means to boost the Verbal competence. I really like their videos, especially for RC, CR and SC. You do check their study methods at https://www.gmatpill.com
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