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    Hi there,

    I'm a student going into Year 11, trying to attempt some problem-solving questions in mathematics. I have been stuck on a question for quite a while, and even knowing the answers does not help me work backwards.

    Question:
    Gary buys three mobile phone cases and two charging leads and pays £29.50. At the same time his friend buys two phone cases, but takes a charging lead back, gets a full refund and pays £11.50.
    What is the cost of a mobile phone case? What is the cost of a charging lead?

    The spoiler contains the answers. I would appreciate any help!

    Thanks
    Spoiler:
    Show
    Answer for phone case: £7.50
    Answer for charging lead: £3.50
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    (Original post by Pandora___)
    Hi there,

    I'm a student going into Year 11, trying to attempt some problem-solving questions in mathematics. I have been stuck on a question for quite a while, and even knowing the answers does not help me work backwards.

    Question:
    Gary buys three mobile phone cases and two charging leads and pays £29.50. At the same time his friend buys two phone cases, but takes a charging lead back, gets a full refund and pays £11.50.
    What is the cost of a mobile phone case? What is the cost of a charging lead?

    The spoiler contains the answers. I would appreciate any help!

    Thanks
    Spoiler:
    Show
    Answer for phone case: £7.50
    Answer for charging lead: £3.50
    Use some algebra to help and lay out the problem:

    3c + 2l = 29.5
    2c - l = 11.5

    where c is the case and l is the lead


    Now solve them simultaneously.
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    (Original post by RDKGames)
    Use some algebra to help and lay out the problem:

    3c + 2l = 29.5
    2c - l = 11.5

    where c is the case and l is the lead


    Now solve them simultaneously.
    Thank you so much!
 
 
 
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