advance algebra

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The sum of two numbers is 81, one of the numbers is 9 more than the other.What are the numbers?

please help..thanks a lot

  • advance algebra -

    x + (x + 9) = 81

    2x = 72

    x = 36

    x + 9 = 45

  • advance algebra -

    i think of 3 positive numbers. the greatest number is twice a perfect square. the least of them is 1 less than half the greatest number. the average of the 3 numbers is 12.

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