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 Post subject: Help with this question pleasePosted: Fri Mar 08, 2013 12:37 pm

Joined: Sun Dec 09, 2012 1:25 pm
Posts: 24

The mean (average) of four whole numbers is 16. The mean of three of them is 14.
The remaining number must be
A 2
B 15
C 22
D 30

This is fron sample paper of LANCASTER ROYAL GRAMMAR SCHOOL.

Thanks

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 Post subject: Re: Help with this question pleasePosted: Fri Mar 08, 2013 12:41 pm

Joined: Fri Sep 15, 2006 8:51 am
Posts: 8113
henna025 wrote:

The mean (average) of four whole numbers is 16. The mean of three of them is 14.
The remaining number must be
A 2
B 15
C 22
D 30

This is fron sample paper of LANCASTER ROYAL GRAMMAR SCHOOL.

Thanks

If the mean of 4 numbers is 16 then the total = 64
if the mean of 3 numbers is 14 then the total is 42

so remaining number is 22 i e how much do you have to add to get a mean of 16.

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 Post subject: Re: Help with this question pleasePosted: Fri Mar 08, 2013 2:57 pm

Joined: Sun Dec 09, 2012 1:25 pm
Posts: 24
Thanks a lot

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