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22 November, 18:19

Dan the detective looked for a number. he found a two-digit number less than 50. the sum of its digits was 12. their different was 4. what number did da find

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  1. 22 November, 21:28
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    You can quickly tell it is 48, that's the only possibility

    for numbers that you cannot quickly tell, suppose the one's digit is x, and the tens' digit is y

    in this case, x+y=12 and x-y=4.

    add the two equation to eliminate y: 2x=16, x=8

    y=x-4=4

    the number is 48
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