11 Plus Exams Forum https://www.elevenplusexams.co.uk/forum/11plus/ 

Kindly help me with this question https://www.elevenplusexams.co.uk/forum/11plus/viewtopic.php?f=2&t=60151 
Page 1 of 1 
Author:  Parent 1 [ Mon Feb 03, 2020 6:52 pm ] 
Post subject:  Kindly help me with this question 
The large cog has 8 grooves and small cog has 6 grooves . The large cog makes 15 complete revolutions. At the same time how many complete revolutions does the small cog make ? 
Author:  loobylou [ Mon Feb 03, 2020 11:05 pm ] 
Post subject:  Re: Kindly help me with this question 
I'm no maths expert but I would do: For every full rotation the big cog does, the little one has to do 8/6 (It has to do more because it's smaller and the proportion has to be 8:6). The big cog does 15, so the little one does 8/6 x 15 = 4/3 x 15 = 60/3 = 20 
Page 1 of 1  All times are UTC [ DST ] 
Powered by phpBB® Forum Software © phpBB Group http://www.phpbb.com/ 