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/