book Maths Puzzle Numerical Ability

I am a two digit number. My ones and tens digits are the same. The sum of my digits is 8. What number am I?

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book Other Question

the square of a number exceeds 11 times the number by 312. find the number. Hi I am having trouble with this question. Can you help?

9^(4x-3)=4^(2x-4)