Tricky question 11 to 12 maths, paper 3, question 31

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moonwalk
Posts: 11
Joined: Tue Jul 24, 2012 2:56 pm

Tricky question 11 to 12 maths, paper 3, question 31

Post by moonwalk »

If (L + M - N) = 68 and M = 31, WHAT IS (L - N) / 2?

Method needed, answer is 18 1/2 or 18.5

Thanks
yoyo123
Posts: 8099
Joined: Mon Jun 18, 2007 3:32 pm
Location: East Kent

Re: Tricky question 11 to 12 maths, paper 3, question 31

Post by yoyo123 »

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
Okanagan
Posts: 1706
Joined: Mon Aug 22, 2011 9:20 pm
Location: Warwickshire

Re: Tricky question 11 to 12 maths, paper 3, question 31

Post by Okanagan »

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
moonwalk
Posts: 11
Joined: Tue Jul 24, 2012 2:56 pm

Re: Tricky question 11 to 12 maths, paper 3, question 31

Post by moonwalk »

Thanks guys. It's amazing the speed a response is given and the number of users willing to help.
:)
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