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13 Feb 2019, 00:48
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
88% (01:13) correct
12%
(01:42)
wrong
based on 111
sessions
History
Date
Time
Result
Not Attempted Yet
Roland and Felicia are testing circuit boards for wiring errors. Working together, they can test a circuit board in eight minutes. How many circuit boards can Felicia test in an hour
on her own?
(1) Felicia can test circuit boards twice as fast as Roland.
(2) If Roland and Felicia get their friend Cory to help them, they can all work together to test a circuit board in seven minutes.
on her own?
(1) Felicia can test circuit boards twice as fast as Roland.
(2) If Roland and Felicia get their friend Cory to help them, they can all work together to test a circuit board in seven minutes.
Archit3110
19 Feb 2019, 05:00
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Bunuel
#1
R+F/RF=1/8
so F=2R
so
3R/2R^2= 1/8
R= 12 mins
sufficient
#2
R+C+F/RCF= 1/7
rate of C and R not known
insuffcient
IMO A
07 Mar 2019, 01:35
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Archit3110
