book Maths Puzzle Numerical Ability

what is the difference between rational and irrational numbers?

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Hi I have a problem with a this question that I need help with.

(1)Translate into a variable expression "and" simplify:

"three times the difference of twice a number and twelve",
Y-6X=-1
what is Y
y = 6x- 1 simply take term having 'x' to other side