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PostPosted: Fri Mar 18, 2011 9:48 pm 
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Joined: Thu Apr 08, 2010 10:28 pm
Posts: 95
Location: London
Please could anyone help me on this sum !


A milkman and a baker deliver to the same house.

In a period of 28 days, the milkman calls every second day and the baker every third day.

They meet at the house twice in the first 7 days.

How many more times do they meet during the 4 week period ?

The answer is : 3 times


Please explain how to solve these type of questions. :idea:
Thank you.


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PostPosted: Sat Mar 19, 2011 10:43 am 
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Joined: Fri Oct 12, 2007 12:42 pm
Posts: 3817
Location: Chelmsford and pleased
Write out the multiples of 2 and 3

2, 4, 6, ...
3, 6, ...

This tells us that they meet every 6 days.

If they met twice in the first week they both started on day 1 (Sunday) and met again on day 7 (Saturday).
In the subsequent week they must meet on day 6 (Friday).
In week three they would meet on day 5 (Thursday) and finally in week 4 they would meet on day 4 (Wednesday).

Many children are happiest with these if you write out the days of the week and then count on six each time.


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PostPosted: Sat Mar 19, 2011 11:08 am 
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Joined: Mon Jun 18, 2007 2:32 pm
Posts: 6966
Location: East Kent
I find a diagram helps with this sort of question


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PostPosted: Sat Mar 19, 2011 1:09 pm 
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Joined: Thu Jan 03, 2008 8:26 am
Posts: 1326
Location: Watford, Herts
viewtopic.php?f=2&t=11353&p=126376#p126376

Many of these questions have been asked before, and you can find the discussions using the Search function at the top of the page.


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PostPosted: Sun Mar 20, 2011 4:46 pm 
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Joined: Thu Apr 08, 2010 10:28 pm
Posts: 95
Location: London
Thanks everyone for the reply and it was a clear explanation! :D


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