exam Maths Puzzle Numerical Ability

can u please solve this for me.
the sum of the digit of a two digit number is 11. when the digit are reversed, the new number is increased by 20 which is twice the original number. find the original number?

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exam Other Question
How do I figure out the answer to this: 2x² y²- 8xy + 12x²y

Can someone show me step by step? Thanks. Does anyone know how to solve?
Thank You

14 sqrt (-6)^14