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Bunuel
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A survey of 500 students of DMP University, produced the information 29 Jun 2021, 06:30
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

65% (hard)

Question Stats:

63% (02:36) correct 37% (02:57) wrong based on 293 sessions

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A survey of 500 students of DMP University, produced the information that 285 students study MBBS, 195 study BHMS, 115 study BAMS, 45 study MBBS and BAMS, 70 study MBBS and BHMS, 50 study BHMS and BAMS, and 50 study none of the three subjects. How many students study all the three subjects?

(A) 10
(B) 15
(C) 18
(D) 20
(E) 25
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D
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G1987
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A survey of 500 students of DMP University, produced the information 08 Jul 2021, 07:43
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Hi Bunuel,
It took me 4.55 to solve this question. This is concerning. Any tips you can share to solve these types of problems quickly. Thanks.
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ashakank
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A survey of 500 students of DMP University, produced the information 13 Jul 2021, 22:31
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(285 students study MBBS + 195 study BHMS +115 study BAMS + 50 study none of the three subjects) - (45 study MBBS and BAMS + 70 study MBBS and BHMS +50 study BHMS and BAMS) = 480

students study all the three subjects = 500-480
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A survey of 500 students of DMP University, produced the information 13 Jul 2021, 23:46
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Total - None = MBBS + BHMS + BAMS + ALL - (MMBS and BAMS) - (MMBS and BHMS) - (BHMS and BAMS)

=> 500 - 50 = 285 + 195 + 115 + ALL - (45 + 70 + 50)

=> 450 = 430 + ALL

=> ALL = 20

Answer D
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A survey of 500 students of DMP University, produced the information 15 Jul 2021, 00:32
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Bunuel to call him

I’m not an expert, but one recommendation I could make is to try to get better at addition and “playing” with numbers.

Practice adding numbers in your head so you get used to adding numbers quickly (I imagine that a lot of time goes into calculations on these types of problems)

You will be slower at first maybe but if you practice enough you’ll save a lot of time.

G1987
Hi Bunuel,
It took me 4.55 to solve this question. This is concerning. Any tips you can share to solve these types of problems quickly. Thanks.
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ShreyasJavahar
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A survey of 500 students of DMP University, produced the information 05 Aug 2021, 02:13
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G1987
Hi Bunuel,
It took me 4.55 to solve this question. This is concerning. Any tips you can share to solve these types of problems quickly. Thanks.
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Refer to the second post on this page https://gmatclub.com/forum/formulae-for-3-overlapping-sets-69014.html#p729340, Bunuel's post that is.
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A survey of 500 students of DMP University, produced the information 07 Jan 2025, 07:38
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