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 Post subject: Maths question
PostPosted: Thu Apr 15, 2010 4:50 pm 
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Joined: Wed Apr 07, 2010 10:01 pm
Posts: 42
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 £5 more than David
David has £1.50 more than Maria
Altogether Zainab, David and Maria have £13.10

How much money has Maria got?

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

Thanking you in advance


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 Post subject:
PostPosted: Thu Apr 15, 2010 5:06 pm 
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Joined: Thu Apr 08, 2010 10:28 pm
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Location: London
If the answer is 2.20 then I will explain...
Please let me know

:lol:


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

Not adding up to 13.10 :wink:


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 Post subject: Maths problem
PostPosted: Thu Apr 15, 2010 5:13 pm 
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Sorry Tulip... although I do not know the answer as there was no answer pack with the exam paper, your answer cannot be right...

Any other ideas please?


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 Post subject:
PostPosted: Thu Apr 15, 2010 5:14 pm 
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think maria has 1.70 :?:


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PostPosted: Thu Apr 15, 2010 5:16 pm 
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Joined: Tue Oct 28, 2008 6:41 pm
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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
Instead of:
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 8)
m = 1.7 (divide by 3)

So the answer is Maria has £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 question
PostPosted: Thu Apr 15, 2010 5:18 pm 
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Joined: Wed Apr 07, 2010 10:01 pm
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Thanks...thats brilliant.

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


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 Post subject:
PostPosted: Thu Apr 15, 2010 5:19 pm 
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How I worked it out? Isn't that what I just posted?? :shock: Confused.

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 Post subject:
PostPosted: Thu Apr 15, 2010 5:22 pm 
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LuluQueen wrote:
How I worked it out? Isn't that what I just posted?? :shock: Confused.


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


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 Post subject: To Lulu Queen
PostPosted: Thu Apr 15, 2010 5:22 pm 
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Joined: Wed Apr 07, 2010 10:01 pm
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Apologies. Was responding to Tiredmum.


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