Skip to main content

Post content has been hidden

To unblock this content, please click here

B
Beginner October 2007

Maths question

Bridget F, 22 April, 2008 at 20:36 Posted on Off Topic Posts 0 10

The dreaded thing has happened. I'm too thick to help my 9 year old with his numeracy homework...

(in my defence I've been travelling for 14 hours today including an infuriating visit to terminal 5 and my suitcase is god only knows where so my brain is not in tip top condition...)

Can anyone help with this, or help me give clues as to how I even begin....

I buy 4 cups of tea and 5 tea cakes for £5. The tea is 10p less than a tea cake.
How much is it for a) cup of tea b) tea cake

I hated these kind of things at school and could never do them then let alone now [:I]?

10 replies

Latest activity by marmalade atkins, 22 April, 2008 at 21:30
  • whirlwind666
    Beginner November 2009
    whirlwind666 ·
    • Report
    • Hide content

    Is it 50p for a cup of tea and 60p for a teacake?

    (4x50 =200) + (5x60 = 300)

    HTH

    • Reply
  • B
    Beginner October 2007
    Bridget F ·
    • Report
    • Hide content

    Cool - that works thank you!

    BUT! how did you work that out - I just don't know where you'd start!! Is there some sort of process?

    • Reply
  • nynaeve
    Beginner December 2013
    nynaeve ·
    • Report
    • Hide content

    Sounds like algebra

    I buy 4 cups of tea and 5 tea cakes for £5. The tea is 10p less than a tea cake. How much is it for a) cup of tea b) tea cake

    4t + tc = 500
    t = c - 10

    where t = tea
    c = cake

    I have no idea actually.

    • Reply
  • nynaeve
    Beginner December 2013
    nynaeve ·
    • Report
    • Hide content

    Sorry typo

    4t + 5cid="red"> = 500
    t = c - 10

    where t = tea
    c = cake

    • Reply
  • G
    Beginner October 2003
    glynbo ·
    • Report
    • Hide content

    5 x 10 = 50p

    5.00 - 50p = £4.50

    £4.50 / 9 items is 50p

    is this any help?

    • Reply
  • D
    Dopper ·
    • Report
    • Hide content

    I'd approach it by doing this:

    t=tea, cake is t+10p

    4t + 5*(t+10)=500p
    4t+5t+50=500p
    9t=450p
    t=450/9
    t=50

    therefore cup of tea = 50p
    cake = tea + 10p, so therefore 60p

    4*50p = 200
    5*(50p+10p)=5*60p=300
    so they add up to £5


    • Reply
  • Smint
    Beginner June 2007
    Smint ·
    • Report
    • Hide content

    quote:Originally posted by nynaeve
    Sorry typo

    4t + 5cid="red"> = 500
    t = c - 10

    where t = tea
    c = cake
    id="quote">

    That's right ?

    4t + 5c = 500
    t = c - 10

    4(c - 10) + 5c = 500

    4c - 40 + 5c = 500

    9c = 500 + 40

    c = 540/9 = 60


    t = c - 10

    t = 60 - 10

    t = 50

    So t (tea) = 50p and c (cake) = 60p

    QED ?
    • Reply
  • whirlwind666
    Beginner November 2009
    whirlwind666 ·
    • Report
    • Hide content

    Really sorry I don't know how I worked it out, it just came.... I think I realised somewhere in the drunk, grey matter that 5x6=30 and 4x5=20 there was definitely a 60p and 50p sound like thay work moment.... SORRY........

    • Reply
  • Knownowt
    Knownowt ·
    • Report
    • Hide content

    quote:Originally posted by nynaeve
    Sorry typo

    4t + 5cid="red"> = 500
    t = c - 10

    where t = tea
    c = cake
    id="quote">

    Yep, you then replace the ts:

    4(c-10) + 5c=500
    4c - 40 + 5c=500
    9c-40=500
    9c=540
    c= 60

    Then replace the cs with 60:

    4t + 300 = 500
    4t = 200
    t = 50
    • Reply
  • B
    Beginner October 2007
    Bridget F ·
    • Report
    • Hide content

    Brilliant - thanks guys - it kind of makes sense?

    Son has now worked it out with a couple of clues got from your replies ?

    • Reply
  • marmalade atkins
    Beginner January 2008
    marmalade atkins ·
    • Report
    • Hide content

    Well, to simplify it for the 9 year old, I'd say that

    you buy 9 things;

    there is a total of a 50 pence (5 cakes times the 10p) difference in the price of those things;

    £5 minus 50p = £4.50;

    £4.50 divided by 9 is 50p;

    50p plus the 10p = 60p.

    I don't think my 9 year old would get all the algebra yet.

    • Reply

You voted for . Add a comment 👇

×


Related articles

Premium members

  • Q
    Qa Test I got married in August - 2022 North Yorkshire

General groups

Hitched article topics

Contest icon

Win £3,000 for your wedding

Join Hitched Rewards, where you can win £3,000 simply by planning your wedding with us. Start collecting entries, it's easy and free!

Enter now