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Math Help - Worded algebra question

  1. #1
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    Worded algebra question

    The average of five numbers is 20. When a sixth number is included,the average of the six numbers is 25. Find the value of the sixth number.

    Is this question even possible?
    If so, could anyone give me some pointers on how to attempt it?
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  2. #2
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    HINT: (100 + n) / 6 = 25
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  3. #3
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    What does the 100 in your equation represent?
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  4. #4
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    Quote Originally Posted by user_5 View Post
    What does the 100 in your equation represent?
    Since the average of the first 5 numbers was 20, that means that they had to add up to 100 since 100/5=20. Solve the equation from the previous post to find the 6th number.
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