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 Post subject: Tricky maths question
PostPosted: Sun Dec 30, 2007 2:58 pm 
Can anyone help solve the below maths question:

On a Monday morning, a teacher asked a class of 25 boys whether they had taken a bath or shower during the weekend. Eighteen boys had a shower, 10 had a bath and 3 had neither and were very dirty. How many boys had taken both a bath and a shower.

Thanks


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 Post subject:
PostPosted: Sun Dec 30, 2007 3:43 pm 
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Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11936
25 in the class - first subtract those who had neither, 25 - 3 = 22

Some boys have been counted twice [ie had both a shower and a bath]

18 + 10 = 28 but there are only 22 boys that we are talking about.

So 28 - 22 = 6 so 6 have been counted twice and had both a bath and a shower.

[Rather a silly question as who can imagine any 11 year old boy wanting BOTH!!! :lol: ]

These are usually best done using a Venn diagram but I cannot draw one on here ...


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 Post subject: Tricky maths question
PostPosted: Sun Dec 30, 2007 5:05 pm 
Thanks Guesr55 for your help. I can't imagine my brother wanting both! :lol:


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 Post subject:
PostPosted: Sun Dec 30, 2007 8:44 pm 
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Joined: Mon Jun 18, 2007 2:32 pm
Posts: 6965
Location: East Kent
depends on their age, some will spend an hour in the shower and some will not even realise that there is no hot water after a week- long boiler breakdown....

yours
mother of a teenaged boy
of kent :wink:


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