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I love these: T = tens place or first digit. U = ones place, units place, or second digit. 10T+U is the first number T+U=15 = T=15-U 10U+T is the number with the digits switched. 10U+T=10T+U+9 10U+15-U=10(15-U)+U+9 9U+15=150-10U+U+9 9U+15=159-9U 18U=144 U=8 T=15-8 T=7

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Q: The sum of 2 digit no is 15 The no obtained on interchanging the digits exceeds the given no by 9 find the no?
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The sum of the digits of a two digit number is 9 the number obtained by reversing the order of the digits of the gven numbers exceeds the given number by 27 find the given numbers?

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