book Maths Puzzle Numerical Ability

Could someone help me please with this problem?
I am having a meltdown with polynomials, LCDs and division.
I am supposed to find the LCD, convert into an equivalent rational exp

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book Other Question

The sum of the digets of a two digit number is 10. if the digets were reversed, the new number would be 54 less than the original number. find the original number.
thanx
What does the following mean?

XIX 19