exam Maths Puzzle Numerical Ability

I am totally confused. I need to describe a whole number algorithm that does not hold true for rational numbers. I do not need to use a complex algorithm; it can be a very basic

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exam Other Question

if 2 is subtracted from a number and this difference is tripled, the result is 6 more than the number. find the number. Help me please!
I have two bills total 120,000$. One of them is not a 100,000$ bill. What are they?-