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Daifu University Question

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Senior Manager
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Daifu University Question [#permalink] New post 30 Jun 2004, 19:00
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Could someone explain the answer to me ? I couldn't get it :(
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ash
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Joined: 31 Dec 1969
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 [#permalink] New post 01 Jul 2004, 02:43
Look at the solution this way...

Let there be total of 100 students

Therefore no. of students who are members of commitee and also want to reduce costs = 40

Students who want reduced costs but not members of committee are 20% of total students who want reduced costs(TC).

Therefore students who want reduced costs and are member of commitee are 80% of total students who want reduced costs, which is 40 as mentioned above.

Hence .8 of TC = 40 => TC = 50.

Hope this helps
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 [#permalink] New post 01 Jul 2004, 03:04
oops!! forgot to log in last time... :oops:

Look at the solution this way...

Let there be total of 100 students

Therefore no. of students who are members of commitee and also want to reduce costs = 40

Students who want reduced costs but not members of committee are 20% of total students who want reduced costs(TC).

Therefore students who want reduced costs and are member of commitee are 80% of total students who want reduced costs, which is 40 as mentioned above.

Hence .8 of TC = 40 => TC = 50.

Hope this helps
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 [#permalink] New post 01 Jul 2004, 11:42
When they give you two sets of categories (in this case, 1) members/non-members and 2) reduce tuition / not reduce), I make a matrix to keep all the info straight and I find this easiest. This particular problem wasn't too hard, but sometimes they will make it really wordy and not so straightforward which is why sometimes making a matrix would help.

I just jot down the categories (male/female, student/teacher, students who fail/students who pass, etc), pick numbers, and then fill it out as I read (in this case, if total students is 100, that means non-members supporting reduction is 40, etc.). I tend to get confused by all the wording, so this way you can just see the relationships.
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 [#permalink] New post 02 Jul 2004, 07:33
excellent problem!
  [#permalink] 02 Jul 2004, 07:33
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