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26 Jun 2025, 00:30
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Difficulty:
15%
(low)
Question Stats:
83% (01:29) correct
17%
(02:17)
wrong
based on 95
sessions
History
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Time
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There were P people in a room when a meeting started. Q people left the room during the first hour, while R people entered the room during the same time. What expression gives the number of people in the room after the first hour as a percentage of the number of people in the room who have been there since the meeting started?
(A) \(\frac{(P - Q)}{(P - Q + R)}\)
(B) \(100 * \frac{(P - Q + R)}{(P - Q)}\)
(C) \(\frac{(P + R)}{(P - Q)}\)
(D) \(100 * \frac{(P - Q)}{(P - Q + R)}\)
(E) \(100 * \frac{(P + R)}{(P - Q)}\)
Gentle note to all experts and tutors: Please refrain from replying to this question until the Official Answer (OA) is revealed. Let students attempt to solve it first. You are all welcome to contribute posts after the OA is posted. Thank you all for your cooperation!
(A) \(\frac{(P - Q)}{(P - Q + R)}\)
(B) \(100 * \frac{(P - Q + R)}{(P - Q)}\)
(C) \(\frac{(P + R)}{(P - Q)}\)
(D) \(100 * \frac{(P - Q)}{(P - Q + R)}\)
(E) \(100 * \frac{(P + R)}{(P - Q)}\)
Gentle note to all experts and tutors: Please refrain from replying to this question until the Official Answer (OA) is revealed. Let students attempt to solve it first. You are all welcome to contribute posts after the OA is posted. Thank you all for your cooperation!
26 Jun 2025, 01:20
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Number of people in the room currently = P -Q + R
Number pf people who have been there since starting = P - Q
Required Percentage = \(100×\frac{(P-Q+R)}{(P-Q)}\)
Hence option B is correct
Number pf people who have been there since starting = P - Q
Required Percentage = \(100×\frac{(P-Q+R)}{(P-Q)}\)
Hence option B is correct
26 Jun 2025, 01:48
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People In the start = P
People left after first hour, after Q people left = P-Q
Total people after R people joined = P-Q+R
Number of people in the room after the first hour as a percentage of the number of people in the room who have been there since the meeting started = \(100 * \frac{(P - Q + R)}{(P - Q)}\)
People left after first hour, after Q people left = P-Q
Total people after R people joined = P-Q+R
Number of people in the room after the first hour as a percentage of the number of people in the room who have been there since the meeting started = \(100 * \frac{(P - Q + R)}{(P - Q)}\)
Bunuel
