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19 Dec 2024, 10:29
Kudos
Bookmarks
Bunuel
N(X) => number of members of an equivalence class X
Case 1:
N(female) = 2 * N(unregistered)
Doesn't give total user info...
Case 2:
N(male + registered) = 800
Doesn't give info females unregistered users...
Case 1 + 2:
N(male + registered) = 800
N(male + unregistered) = 200
N(female + registered) = 1600 [bcz, N(registered) - N(male + registered)]
N(female + unregistered) = x
1600 + x = 2 * (200 + x) => x = 1200
Hence answer is C
19 Dec 2024, 10:33
Kudos
Bookmarks
Registered Males = Mr
Unregistered Males = Mu
Registered Females = Fr
Unregistered Females = Fu
Total online users = T
Mr + Fr = 2400
Mr + Mu = 1000
T = Mr + Mu + Fr + Fu = 1000 + Fr + Fu
(1) The number of online female users is twice the number of online unregistered users.
Fr + Fu = 2 * (Fu + Mu)
=> T = 2400 + (Fu + Mu)
=> 1000 + (Fr + Fu) = 2400 + (Fr + Fu)/2
=> Fr + Fu = 2800
=> T = 1000 + 2800 = 3800
Statement 1 alone is sufficient.
(2) Among the online users, 800 are registered males.
Mr = 800
=> Fr = 1600
=> Mu = 200
=> Fu = ?
Statement 2 alone is not sufficient.
Answer: A
Unregistered Males = Mu
Registered Females = Fr
Unregistered Females = Fu
Total online users = T
Mr + Fr = 2400
Mr + Mu = 1000
T = Mr + Mu + Fr + Fu = 1000 + Fr + Fu
(1) The number of online female users is twice the number of online unregistered users.
Fr + Fu = 2 * (Fu + Mu)
=> T = 2400 + (Fu + Mu)
=> 1000 + (Fr + Fu) = 2400 + (Fr + Fu)/2
=> Fr + Fu = 2800
=> T = 1000 + 2800 = 3800
Statement 1 alone is sufficient.
(2) Among the online users, 800 are registered males.
Mr = 800
=> Fr = 1600
=> Mu = 200
=> Fu = ?
Statement 2 alone is not sufficient.
Answer: A
19 Dec 2024, 10:48
Kudos
Bookmarks
Bunuel
Currently online comprises of registered users and unregistered users.
(1) We only know the number of male (include registered and unregistered) is 1,000
Number of registered males is unknown to inferred online female users (insufficient)
(2) We have no information over online unregistered users (insufficient)
(1)+(2) As 800 registered user is male => 2,400-800 = 1,600 registered female
=> online unregistered users = 1,600/2 = 800
So the all the users that currently online are
800 online registered males + 1,600 online registered females + 800 unregistered users = 3,200 (sufficient)
Therefore the answer is C
