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Math Help - Electronic bank teller question

  1. #1
    Junior Member
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    Electronic bank teller question

    An electronic bank teller registered $775 after it had counted 120 notes and $975 after it had counted 160 notes.
    Find a formula for the sum registered, in terms of the number of notes counted.
    Was there a sum already on the register when counting began?
    If so, how much?
    Thanks in advance.
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  2. #2
    MHF Contributor harish21's Avatar
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    Let Y = sum registered

    N = Number of notes counted

    a = value of notes

    S= sum in the register when counting began...

    then by your question...

    775 = 120a+s

    975=160a+s

    then.....
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  3. #3
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    Thanks so much.
    I had this question in my worksheet as well.
    I ended up getting it right.
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  4. #4
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    Thanks for all of your help.
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