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    alex spent 2/7 of his pocket money on computer games.he spent 1/4 of his pockets money on sweets. he saved the rest. given that alex saved £3.90, work out how much pocket money he got.

    the answer is £8.40

    right this is the question and i cant work out how to get £8.40 ... please help meeeeeeeeeeeeeeeeee
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    (Original post by moniasajid)
    alex spent 2/7 of his pocket money on computer games.he spent 1/4 of his pockets money on sweets. he saved the rest. given that alex saved £3.90, work out how much pocket money he got.

    the answer is £8.40

    right this is the question and i cant work out how to get £8.40 ... please help meeeeeeeeeeeeeeeeee
    Take x to be the amount of pocket money he had originally and form an equation
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    First off, find a common denominator for 2/7 and 1/4. It is 28.
    7*4=28, so do the same to the numerator. 2*4=8. So now your 2/7 has become 8/28.
    Now do the same for the second fraction. 4*7=28. So, 1*7=7. So that fraction has become 7/28.
    Right, now add them together.
    8/28+7/28= 15/28. That's how much pocket money he spent overall.
    So the amount left over would be 13/28, as a fraction.
    We know 13/28 is £3.90, because it's been given. Now divide £3.90 by 13= 30p. So, 1/28= 30p.
    Now multiply 30p by the denominator, 28 to get 30*28= 840.
    Put that into the right format and you get £8.40!


    ~We live in an age of smart phones and stupid people.
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    (Original post by Meliss)
    First off, find a common denominator for 2/7 and 1/4. It is 28.
    7*4=28, so do the same to the numerator. 2*4=8. So now your 2/7 has become 8/28.
    Now do the same for the second fraction. 4*7=28. So, 1*7=7. So that fraction has become 7/28.
    Right, now add them together.
    8/28+7/28= 15/28. That's how much pocket money he spent overall.
    So the amount left over would be 13/28, as a fraction.
    We know 13/28 is £3.90, because it's been given. Now divide £3.90 by 13= 30p. So, 1/28= 30p.
    Now multiply 30p by the denominator, 28 to get 30*28= 840.
    Put that into the right format and you get £8.40!


    ~We live in an age of smart phones and stupid people.
    aw thank you so much ......
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    (Original post by moniasajid)
    aw thank you so much ......

    Anything else you need help with?


    ~We live in an age of smart phones and stupid people.
 
 
 
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