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 Post subject: Tricky question 11 to 12 maths, paper 3, question 31Posted: Fri Aug 03, 2012 12:15 pm

Joined: Tue Jul 24, 2012 1:56 pm
Posts: 11
If (L + M - N) = 68 and M = 31, WHAT IS (L - N) / 2?

Method needed, answer is 18 1/2 or 18.5

Thanks

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 Posted: Fri Aug 03, 2012 12:30 pm

Joined: Mon Jun 18, 2007 2:32 pm
Posts: 6966
Location: East Kent
If (L+M-N) =68

M=31

so( L+31-N) =68

(L-N) = 31 less than 68

L-N = 68-31 = 37

37/2 = 18.5

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 Posted: Fri Aug 03, 2012 12:31 pm

Joined: Mon Aug 22, 2011 8:20 pm
Posts: 1706
Location: Warwickshire
If (L + M - N) = 68 and M = 31

So subtract 31 or M from each side of the equation gives
(L - N) = 37

so (L - N) / 2 = 37 /2

= 18 1/2 or 18.5

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 Posted: Fri Aug 03, 2012 12:41 pm

Joined: Tue Jul 24, 2012 1:56 pm
Posts: 11
Thanks guys. It's amazing the speed a response is given and the number of users willing to help.

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