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26 Feb 2018, 23:22
Kudos
Bookmarks
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
73% (01:19) correct
27%
(01:25)
wrong
based on 139
sessions
History
Date
Time
Result
Not Attempted Yet
A gear 50 inches in diameter turns a smaller gear 30 inches in diameter. If the larger gear makes 15 revolutions, how many revolutions does the smaller gear make in that time?
(A) 9
(B) 12
(C) 20
(D) 25
(E) 30
(A) 9
(B) 12
(C) 20
(D) 25
(E) 30
27 Feb 2018, 22:53
Kudos
Bookmarks
Bunuel
IMO D circumference of circle is 2pie r and we have diameter than pie d
now we will find total distance covered in 15 revolution
so 15*50pie is total distance covered now we need to divide it by 30pie circumference of smaller circle as we need to find revolutions
15*50 pie/30pie= 25
If you like my explanation then please give me KUDOS
General Discussion
26 Feb 2018, 23:36
Kudos
Bookmarks
Bunuel
If the gear with diameter 50 inches makes 15 revolutions,
then the smaller gear(diameter: 30 inches) makes \(\frac{50}{30} * 15 = 25\) revolutions
Therefore, the smaller gear will make 25 revolutions n the same time(Option D)
