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3 April, 05:40

I thought of a two-digit number. The unit digit of my number is a prime number, and the tens digit is four times as big as the unit digit. What is my number?

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  1. 3 April, 07:21
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    let the number is 10x + 3.

    then sum of its digits = x + 3.

    from given condition, we have

    x+3 = (1/7) * (10x + 3)

    => 7x + 21 = 10x + 3

    => 3x = 18

    => x = 6

    therefore the number is 63.
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