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 Post subject: Maths questionPosted: Thu Apr 15, 2010 4:50 pm

Joined: Wed Apr 07, 2010 10:01 pm
Posts: 44
Hello fellow parents...

I have come across a question in one of the papers which I am finding difficult to work out - can someone please assist. The problem question is:

Zainab has Â£5 more than David
David has Â£1.50 more than Maria
Altogether Zainab, David and Maria have Â£13.10

How much money has Maria got?

It would also help if you could explain the calculation...

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 Post subject: Posted: Thu Apr 15, 2010 5:06 pm

Joined: Thu Apr 08, 2010 10:28 pm
Posts: 95
Location: London
If the answer is 2.20 then I will explain...

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 Post subject: Posted: Thu Apr 15, 2010 5:12 pm

Joined: Sun Nov 01, 2009 1:51 am
Posts: 1161
Not sure that correct as if maria has 2.20
david has 1.50 more = 3.70
and then Zainab 5.00 more than david = 8.70

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 Post subject: Maths problemPosted: Thu Apr 15, 2010 5:13 pm

Joined: Wed Apr 07, 2010 10:01 pm
Posts: 44
Sorry Tulip... although I do not know the answer as there was no answer pack with the exam paper, your answer cannot be right...

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 Post subject: Posted: Thu Apr 15, 2010 5:14 pm

Joined: Sun Nov 01, 2009 1:51 am
Posts: 1161
think maria has 1.70

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 Post subject: Posted: Thu Apr 15, 2010 5:16 pm

Joined: Tue Oct 28, 2008 6:41 pm
Posts: 133
Location: Surrey
Not very good at explanations but I'll give it a try:

Let z, d and m replace the names
From the question, we get:
z = d + 5 Equation One
d = m + 1.5 Equation Two
z + d + m = 13.1 Equation Three
We want to find out how much Maria has, so every equation has to include "m".
We can replace the "d" in Equation One with its equivalent "m + 1.5", so equation one now reads: z = m + 1.5 + 5

Now we know that "m" is in each of the equations, we can replace it in Equation Three, so:

m + 1.5 + 5 + m + 1.5 + m = 13.1
z + d + m = 13.1

If you work that out, it comes to:

3m + 8 = 13.1 which can be solved like a normal equation:

3m + 8 = 13.1
3m = 5.1 (minus
m = 1.7 (divide by 3)

So the answer is Maria has Â£1.70. (Of course, if you wanted to know how much the others had, just work it out some more)

Rather long winded, but gets to the point.
Hope it helps!
LQ

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 Post subject: Maths questionPosted: Thu Apr 15, 2010 5:18 pm

Joined: Wed Apr 07, 2010 10:01 pm
Posts: 44
Thanks...thats brilliant.

Please explain how you worked it out if you do not mind...

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 Post subject: Posted: Thu Apr 15, 2010 5:19 pm

Joined: Tue Oct 28, 2008 6:41 pm
Posts: 133
Location: Surrey
How I worked it out? Isn't that what I just posted?? Confused.

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 Post subject: Posted: Thu Apr 15, 2010 5:22 pm

Joined: Sun Nov 01, 2009 1:51 am
Posts: 1161
LuluQueen wrote:
How I worked it out? Isn't that what I just posted?? Confused.

think he means me lulu. I nipped in with the answer just before you

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 Post subject: To Lulu QueenPosted: Thu Apr 15, 2010 5:22 pm

Joined: Wed Apr 07, 2010 10:01 pm
Posts: 44
Apologies. Was responding to Tiredmum.

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