is this answer correct?-percentages

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jopup: Junior | Next Rank: 30 Posts; Posts: 28; Joined: Sat Jun 14, 2008 5:12 am; Thanked: 1 times

by jopup » Fri Jun 20, 2008 12:25 pm

i get 75% at one point so you need 1/4 of 1200 right?
1/4 of 1200 is 300 isnt it??? the answer should be 300 but it says 400

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Source: Beat The GMAT — Problem Solving | Fri Jun 20, 2008 12:25 pm

punit.kaur.mba: Master | Next Rank: 500 Posts; Posts: 104; Joined: Wed Feb 13, 2008 1:44 pm; Thanked: 8 times

by punit.kaur.mba » Fri Jun 20, 2008 12:36 pm

The answer is 400. Here is the explaination.

Total no of flights (T) = delayed + non-delayed.

Given ,

delayed = 1200 = 75% of T

0.75T = 1200

Hence non-delayed = 0.25T = 1200/3=400

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egybs: Master | Next Rank: 500 Posts; Posts: 178; Joined: Wed May 14, 2008 3:51 pmFollowed by: 1 member; Thanked: 16 times; GMAT Score:99%+

by egybs » Fri Jun 20, 2008 12:37 pm

1200 is the number of delayed flights... which represents 75% of all flights.

so we're looking for what 25% of all flights comes out to. Which is simply 1200/3 = 400.

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punit.kaur.mba: Master | Next Rank: 500 Posts; Posts: 104; Joined: Wed Feb 13, 2008 1:44 pm; Thanked: 8 times

by punit.kaur.mba » Fri Jun 20, 2008 12:38 pm

Read the question carefully... 1200 corresponds to number of delayed flights. not the total flights.

I make such mistakes very often!

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codesnooker: Legendary Member; Posts: 543; Joined: Fri Jan 18, 2008 1:01 am; Thanked: 43 times; GMAT Score:580

by codesnooker » Tue Jun 24, 2008 1:24 am

@jopup

Eveb if 1200 is the total number of flights, still then also how could you get 250 as answer. It is neither 25% of 1200 nor 75%.

Please check your basics.

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