Maths

The sum of two digits number is 7. In changing position of digits we get the number 9 less than the original number. What is number?

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  1. If the digits are t and u, then the value of the number is 10t+u. So, we have

    t+u=7
    10u+t = 10t+u-9

    Now just solve for t and u.

    You can do this without any algebra. I mean, how many pairs of numbers add up to 7? Just try them.

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