BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Pls Explain

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 124
Joined: Mon May 19, 2008 1:12 pm
Thanked: 3 times

Pls Explain

by Nycgrl » Wed Aug 06, 2008 3:27 pm
Of the science books in a certain supply room, 50 are on botany, 65 are on zoology, 90 are on physics. 50 are on geology, and 110 are on chemistry. If science books are removed randomly from the supply room, how many must be removed to ensure that 80 of the books removed are on the same science?
(A) 81
(B) 159
(C) 166
(D) 285
(E) 324
Top
Source: — Problem Solving |
Legendary Member
Posts: 1153
Joined: Wed Jun 20, 2007 6:21 am
Thanked: 146 times
Followed by:2 members

by parallel_chase » Wed Aug 06, 2008 3:49 pm
You want to remove 80 books of the same science.

Lets take the worst case scenario.

remove 79 from botany = we only have 50
remove 79 from zoology= we only have 65
remove 79 from physics =79
remove 79 from geology= we only have 50
remove 79 from chemistry= 79

50+65+79+50+79= 323

Now we just have to pick 1 more book to make sure we at least have 80 of same science

323+1=324

Let me know if you have any doubts.
Top
Master | Next Rank: 500 Posts
Posts: 124
Joined: Mon May 19, 2008 1:12 pm
Thanked: 3 times

by Nycgrl » Wed Aug 06, 2008 3:51 pm
I solved this question like this only but OA is 81.
Top
Legendary Member
Posts: 1153
Joined: Wed Jun 20, 2007 6:21 am
Thanked: 146 times
Followed by:2 members

by parallel_chase » Wed Aug 06, 2008 4:00 pm
Nycgrl wrote:I solved this question like this only but OA is 81.
The OA is 324. I solved this question yesterday, refer this

https://www.beatthegmat.com/science-book ... html#65305
Top
Junior | Next Rank: 30 Posts
Posts: 10
Joined: Tue Jul 22, 2008 6:57 pm

by Wakka Wakka » Wed Aug 06, 2008 4:03 pm
dumb question what is OA?
Top
Master | Next Rank: 500 Posts
Posts: 124
Joined: Mon May 19, 2008 1:12 pm
Thanked: 3 times

by Nycgrl » Wed Aug 06, 2008 4:10 pm
parallel_chase wrote:
Nycgrl wrote:I solved this question like this only but OA is 81.
The OA is 324. I solved this question yesterday, refer this

https://www.beatthegmat.com/science-book ... html#65305

Thanks Parallel_chase
Top
Junior | Next Rank: 30 Posts
Posts: 10
Joined: Tue Jul 22, 2008 6:57 pm

by Wakka Wakka » Wed Aug 06, 2008 4:11 pm
nevermind...tired...time to stop studying
Top
Post new topic Post Reply
• Page 1 of 1