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A certain class, consisting of a lecture and a question-and-answer ses

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A certain class, consisting of a lecture and a question-and-answer ses  [#permalink]

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New post 25 Jul 2018, 00:06
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A certain class, consisting of a lecture and a question-and-answer session, lasted from 2:45 to 4:30 one afternoon. If the lecture lasted from 2:45 to 4:15, then the question-and-answer session was what fraction of the total class time?

A) 1/7
B) 1/6
C) 1/5
D) 1/4
E) 1/3

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Re: A certain class, consisting of a lecture and a question-and-answer ses  [#permalink]

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New post 25 Jul 2018, 00:29
Total class time from 2:45 to 4:30 =>105

lecture lasted from 2:45 to 4:15 => 90 minutes

question-and-answer session lecture lasted from 4:15 to 4:30 => 15 minutes

question-and-answer session was what fraction of the total class time = \(\frac{15}{105}\) = \(\frac{1}{7}\)

Hence option A
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Re: A certain class, consisting of a lecture and a question-and-answer ses  [#permalink]

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New post 26 Jul 2018, 00:54

Solution



Given:
    • A certain class, consisting of a lecture and a question-and-answer session, lasted from 2:45 to 4:30 one afternoon
    • The lecture lasted from 2:45 to 4:15

To find:
    • Fraction of question and answer session of the total class time
      o i.e. Question and Answer session time/Total class time.

Approach and Working:
    • We are given that the class lasted from 2:45 to 4:30 PM
      o i.e. a total of 1 Hour and 45 Minutes.
      o Converting the units into minutes we get:
         Total Cass Time: 105 Minutes (60 minutes + 45 minutes)

    • Lecture lasted from 2:45 to 4:15 PM
      o i.e. for 1 Hour and 30 Minutes
      o Converting into minutes we get
         Lecture time = 90 Minutes.

    • Therefore, Question-and-answer-session time = Class time – Lecture Time
      o i.e. 105 – 90 Minutes = 15 minutes

Hence Fraction of Question and answer time/Class time = \(\frac{15}{105} = \frac{1}{7}\)

Hence, the correct answer is option A.

Answer: A
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Re: A certain class, consisting of a lecture and a question-and-answer ses  [#permalink]

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New post 30 Jul 2018, 10:51
Bunuel wrote:
A certain class, consisting of a lecture and a question-and-answer session, lasted from 2:45 to 4:30 one afternoon. If the lecture lasted from 2:45 to 4:15, then the question-and-answer session was what fraction of the total class time?

A) 1/7
B) 1/6
C) 1/5
D) 1/4
E) 1/3


The total time was 105 minutes, and the lecture was 90 minutes. Thus, the question-and-answer session was 15 minutes, which is 15/105 = 1/7 of the total class time.

Answer: A
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Re: A certain class, consisting of a lecture and a question-and-answer ses  [#permalink]

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New post 02 Oct 2018, 08:56
Bunuel wrote:
A certain class, consisting of a lecture and a question-and-answer session, lasted from 2:45 to 4:30 one afternoon. If the lecture lasted from 2:45 to 4:15, then the question-and-answer session was what fraction of the total class time?

A) 1/7
B) 1/6
C) 1/5
D) 1/4
E) 1/3


Dear Moderator,
Found this algebra question in the Geometry section, hope you will do the needful. Thank you.
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Re: A certain class, consisting of a lecture and a question-and-answer ses  [#permalink]

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New post 02 Oct 2018, 08:59
stne wrote:
Bunuel wrote:
A certain class, consisting of a lecture and a question-and-answer session, lasted from 2:45 to 4:30 one afternoon. If the lecture lasted from 2:45 to 4:15, then the question-and-answer session was what fraction of the total class time?

A) 1/7
B) 1/6
C) 1/5
D) 1/4
E) 1/3


Dear Moderator,
Found this algebra question in the Geometry section, hope you will do the needful. Thank you.

______________
Fixed. Thank you.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: A certain class, consisting of a lecture and a question-and-answer ses   [#permalink] 02 Oct 2018, 08:59
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