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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
73% (01:22) correct
27%
(01:30)
wrong
based on 131
sessions
History
Date
Time
Result
Not Attempted Yet
Suppose half the people on a bus exit at each stop and no additional passengers board the bus. If on the third stop the next to last person exits the bus, then how many people were on the bus?
(A) 20
(B) 16
(C) 8
(D) 6
(E) 4
(A) 20
(B) 16
(C) 8
(D) 6
(E) 4
02 Sep 2024, 03:08
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We can test answer choices in this question,
A. 20
1st stop 10 exit; remaining on bus 10
2nd stop 5 exit; remaining on bus 5
3rd stop => half of 5 is 2.5, which is not possible => INCORRECT
B. 16
1st stop 8 exit; remaining on bus 8
2nd stop 4 exit; remaining on bus 4
3rd stop 2 exit; remaining on bus 2 => After 3rd stop 2 people remain on bus, whereas 1 should remain => INCORRECT
C. 8
1st stop 4 exit; remaining on bus 4
2nd stop 2 exit; remaining on bus 2
3rd stop 1 exit => this was the person next to last => CORRECT
Answer C.
A. 20
1st stop 10 exit; remaining on bus 10
2nd stop 5 exit; remaining on bus 5
3rd stop => half of 5 is 2.5, which is not possible => INCORRECT
B. 16
1st stop 8 exit; remaining on bus 8
2nd stop 4 exit; remaining on bus 4
3rd stop 2 exit; remaining on bus 2 => After 3rd stop 2 people remain on bus, whereas 1 should remain => INCORRECT
C. 8
1st stop 4 exit; remaining on bus 4
2nd stop 2 exit; remaining on bus 2
3rd stop 1 exit => this was the person next to last => CORRECT
Answer C.
02 Sep 2024, 22:52
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At the third stop, one person exits and one person remains in the bus. So, there are 2 people in the bus at the third stop. At each stop half the people exits the bus.
\(3^{rd}\) stop - \(2\)
\(2^{nd}\) stop - \(2*2=4\)
\(1^{st}\) stop - \(4*2=8\)
Answer: C
\(3^{rd}\) stop - \(2\)
\(2^{nd}\) stop - \(2*2=4\)
\(1^{st}\) stop - \(4*2=8\)
Answer: C
