book Maths Puzzle Numerical Ability

I am having problems setting up this problem. The sum of the digits in a two digit number is 8. When the digits are reversed, the new number is 8 less than the original number. What is the original number?

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book Other Question

"the difference between the sum of two numbers squared and their sum squared" Rita invested a portion of her retirement money of PHP 317, 000 at 9% and the remainder at 10&. If the total income is PHP 30,200, how much did she invest at each rate?